Omar Bellorin-Marin, M.D.
Bariatric Surgery
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Omar Bellorin-Marin, M.D.

Bariatric Surgery

Accepts New Patients
Gender: Male
Language: English, Spanish
Insurance: 24 accepted  View

Locations and Appointments

Credentials

Specialties

  • Surgery
  • General Surgery
  • Gastrointestinal Surgery
  • Laparoscopic Surgery

Expertise

  • Diabetes Surgery
  • Bariatric Surgery
  • Gastrointestinal Metabolic Surgery
  • Abdominal Pain
  • Gastric Bypass
  • Achalasia
  • Laparoscopic Bariatric Surgery
  • Adrenal Surgery
  • Bariatric/Weight Loss Surgery
  • Advanced Operative Laparoscopy
  • Obesity
  • Obesity Surgery
  • Computer Assisted Surgery With CT/CTA
  • Endoscopic Surgery
  • Gastrointestinal Disorder
  • Hernia Surgery
  • Idiopathic Thrombocytopenic Purpura
  • Inflammatory Bowel Disease
  • Laparoscopic Gastrointestinal Surgery
  • Laparoscopic Surgery
  • Minimally Invasive Surgery
  • Pancreatic Disease
  • Weight Control
  • Surgery For Weight Loss
  • Gastroparesis
  • GERD (Gastroesophageal Reflux Disease)
  • Robotic Surgery
  • Minimally Invasive Robotic Surgery
  • Da Vinci Robotic Surgery
  • Laparoscopic Gastrointestinal (GI) Surgery
  • Single-Incision Laparoscopic Surgery
  • Advanced Laparoscopic Surgery
  • Surgery, Gastroesophageal Reflux
  • Surgery For Gastroesophageal Reflux
  • Gastroesophageal Reflux Surgery
  • GERD Surgery
  • Gastrointestinal Motility Disorders
  • Laparoscopic Gallbladder Surgery
  • Repair, Hernia
  • Gallbladder Surgery
  • EGD (Esophagogastroduodenoscopy)
  • Gastric Cancer
  • Colon Cancer
  • Gallbladder and Biliary Diseases
  • Endoscopic Treatment of Obesity
  • Stomach Cancer
  • Stomach Surgery
  • Single Incision Laparoscopic Cholecystectomy
  • Single Incision Laparoscopic Colectomy
  • Hiatal Hernia
  • Single Incision Laparoscopic Cholecystectomy With Cholangiography
  • Peptic Ulcer Disease
  • Endoscopy
  • Sliding Hiatal Hernia
  • Repair, Hernia, Hiatal, Robot-Assisted
  • Paraesophageal Hernia
  • Duodenal Ulcer Disease
  • Duodenal Exclusion With Gastrojejunostomy
  • Duodenal Diverticulum
  • Jejunal Adenocarcinoma
  • Jejunal Intussusception
  • Jejunal Polyp
  • Jejunal Ulcer
  • Jejunal Cancer
  • Creation of Jejunal-Ileal Bypass
  • Creation, Bypass, Jejunoileal
  • Diverticulum of Small Intestine
  • Meckels Diverticulum
  • Meckel's Diverticulum
  • Endoscopic Insertion of Intragastric Balloon
  • Insertion, Balloon, Intragastric, Endoscopic
  • Weight Loss Surgery

Qualifications

Board Certifications

  • Surgery

Clinical & Academic Positions

  • Assistant Attending Surgeon - NewYork-Presbyterian Hospital
  • Assistant Professor of Surgery - Weill Cornell Medical College, Cornell University

Education & Training

  • M.D., Central University of Venezuela, School of Medicine (Venezuela), 2003

Research

View Research

Personal Statement

"The best way to treat a patient is to consider him/her as part of my family. Compassion and support are my principal rules. I also believe that a meticulous patient care and team-based approach are the key elements in achieving a personalized plan of care for optimal patient outcomes."

Biography

A dedicated surgeon born in Venezuela, Dr. Bellorin-Marin completed his residency at the University Hospital of Caracas/Central University of Venezuela, his research fellowship at Cleveland Clinic Florida, followed by his residency at NewYork-Presbyterian Queens. He completed his fellowship in advanced GI and minimally invasive surgery, including bariatric, Robotics, abdominal wall hernias, reflux disease, colon and gastric cancer, at NewYork-Presbyterian Hospital/Weill Cornell Medical College. Dr. Bellorin-Marin is an active researcher who has completed numerous peer-reviewed publications and book chapters, and has presented at national and international meetings

Insurance

Insurance Plans Accepted

The following represents most of the managed care plans accepted by this physician. If your insurance carrier does not appear here please contact the physician’s office as they may have individual contracts not included on this site.

* indicates this physician is no longer accepting new patients with this insurance plan.

  • Aetna - Weill Cornell - POS
  • Amida Care
  • Blue Priority Network
  • CIGNA
  • Empire Blue Cross/Blue Shield - Pathway X
  • Empire Blue Cross/Blue Shield - PPO
  • Empire Blue Cross/Blue Shield - Pathway X Enhanced
  • Empire Blue Cross/Blue Shield - HMO
  • Empire Blue Cross/Blue Shield - Mediblue (Senior)
  • Empire Blue Cross/Blue Shield - EPO
  • Fidelis Care
  • Medicaid
  • Medicare
  • Oxford Health Plans - Metro/Core/Charter
  • Oxford Health Plans - Medicare Advantage
  • Oxford Health Plans - Liberty
  • Oxford Health Plans - Freedom
  • Rockefeller University - CoreSource
  • UHC Compass
  • United Empire
  • United Health Care - Medicare
  • United Health Care
  • United Health Care - Community Plan
  • WellCare Health Plans

Honors and Awards

Honors and Awards

 

 

Patient experience exemplar recognition. Valley Medical Group (2018)

The Valley Hospital. Ridgewood NJ

Resident of the Year Award (2016)

NewYork-Presbyterian Queens/Cornell University Medical College Program

Department of General Surgery

Jameson L. Chassin Golden Apple Award (2016)

For excellence in Teaching

NewYork-Presbyterian Queens/Cornell University Medical College Program

Department of General Surgery

Murry Friedman Resident Competition Award (2016)

Brooklyn and Long Island chapter of the American College of Surgeons

Recognition of Outstanding Achievement in Research (2016)

Lang Research Seminar 2016

Theresa & Eugene M Lang Center for Research & Education

NewYork-Presbyterian Queens

Intern of the Year Award (2011)

New York Hospital Medical Center of Queens/Cornell University Medical   College Program

Department of General Surgery

Honorable Mention (2009)

Excellence in Surgical Residency

University Hospital of Caracas / Central University of Venezuela

Caracas, Venezuela

Honors in Surgery, Anatomy and Pathophysiology (2003)

Central University of Venezuela .Caracas, Venezuela

Medal of Dr. Lorenzo Campins y Ballester (2003)

Student Excellence

Central University of Venezuela. Caracas, Venezuela

Award “Dr. Lorenzo Campins y Ballester” (2003)

Highest Score Achievement of medical school class

Central University of Venezuela. Caracas, Venezuela

 

 

    Publications

Gray KD, Moore MD, Elmously A, Bellorin O, Zarnegar R, Dakin G, Pomp A, Afaneh C. (2018) Perioperative Outcomes of Laparoscopic and Robotic Revisional Bariatric Surgery in a Complex Patient Population.Obes Surg. 2018 Jul;28(7):1852-1859.

Gray KD, Moore MD, Bellorin O, Abelson JS, Dakin G, Zarnegar R, Pomp A, Afaneh C. (2018) Increased Metabolic Benefit for Obese, Elderly Patients Undergoing Roux-en-Y Gastric Bypass vs Sleeve Gastrectomy. Obes Surg. 2018 Mar;28(3):636-642.

Bellorin O, Kundel A, Sharma S, Ramirez-Valderrama A, Lee P. (2016) Training model for laparoscopic Heller and Dor fundoplication: a tool for laparoscopic skills training and assessment-construct validity using the GOALS score. Surg Endosc. 2016; 30:3654-3660.

Bellorin O, Shuchleib A, Halevi AE, Aksenov S, Saldinger PF. (2016) Giant type III well-differentiated neuroendocrine tumor of the stomach: A case report. Int J Surg Case Rep. 2016 Jun 16;25:62-65. doi: 10.1016/j.ijscr.2016.06.008. [Epub ahead of print]

Bellorin O, Kundel A, Ramirez-Valderrama A, Castro A. (2015) Gastrojejunal Anastomosis Perforation after Gastric Bypass on a Patient with Underlying Pancreatic Cancer: A Case Report and Review of the Literature. Case Rep Surg. 2015;2015:170901. doi: 10.1155/2015/170901.

Bellorin O, Kundel A, Ni M, Litong D. (2013) Surgical Management of Gastric GIST. The Most recent ACS-NSQIP database. JSLS 2014 Jan-Mar; 18 (1):46-49.

Bellorin O, Abdemur A, Sucandy I, Szomstein S, Rosenthal R. (2011) Understanding the significance, reasons and patterns of abnormal vital signs after gastric bypass for morbid obesity. Obes Surg. 2011 Jun;21(6):707-13.

Bellorin O, Lieb J, Szomstein S, Rosenthal R. (2010) Laparoscopic conversion of sleeve gastrectomy to Roux-en-Y gastric bypass for acute gastric outlet obstruction after laparoscopic sleeve gastrectomy for morbid obesity:  Case report. Surg Obes Relat Dis. 2010 Sep-Oct;6(5):566-8.

Sanchez A, Rodriguez O, Bellorin O, Sánchez R, Benítez G. (2010) Laparoscopic common bile duct exploration in patients with gallstones and choledocolithiasis. JSLS. 2010 Apr-Jun;14(2):246-50.

Acholonu E, McBean E, Court I, Bellorin O, Szomstein S, Rosenthal R. (2009) Safety and Short-Term Outcomes of Laparoscopic Sleeve Gastrectomy as a Revisional Approach for Failed Laparoscopic Adjustable Gastric Banding in the Treatment of Morbid Obesity. Obes Surg 2009; 19(12):1612–1616. 

 

    Other

Bellorin O. Faculty guest for “the Surgeon’s Lounge”. (2017) General Surgery News. Dec 2017;44:16-17

Bellorin O, Zimmerman E, Saldinger P F. (2016) A Safe Stepwise Approach to the Critical View of Safety During Laparoscopic Cholecystectomy. CSurgeries . DOI: http://dx.doi.org/10.17797/ce9i07jf03

Bellorin O. Question for The Surgeon’s lounge. General Surgery News. Nov 2014; 41: 11. 

Ruiz D, Bellorin O, Chousleb S, Addasi T, Tiszenkel H. Colorectal Surgery in a Community Hospital. Results of Open vs. Laparoscopic Colon Surgery in Octogenarians. World Journal of Colorectal Surgery. 2012; 3 (2). Article 5 

Court I, Bellorin O, Dip F, Ducoin C, Szomstein S, Rosenthal R. Laparoscopic Sleeve Gastrectomy. Bariatric Times. Jun 2009; 6(6): 6-11

Rodriguez O, Sanchez-Ismayel A, Bellorin O, Paredes J, Sanchez R. Training Model for Laparoscopic appendectomy. Rev Venez Cir. May 2009; 62(1): 34-39.

A Sánchez Ismayel, O Rodríguez, G Benítez, R Sánchez, Bellorin O Laparoscopic common bile duct exploration and current management of choledocholithiasis: analysis of the first 30 cases. Rev. venez. cir 63(2), 65-71

Bellorin O. Question for The Surgeon’s lounge. General Surgery News. Dec 2008; 35: 12.

Sanchez A, Rodriguez O, Sanchez R, Benitez G, Bellorin O, Paredes J. Intraoperative cholangioscopy in the management of intrahepatic bileduct stones. Revista de la Facultad de Medicina. Sep 2008; 31(1): 65-69.

Sanchez A, Rodriguez O, Bellorin O, Paredes J, Sanchez R. Use of the choledochoscope in the laparoscopic common bile duct exploration for choledocholithiasis resolution. Rev Venez Cir. Dec 2007; 60(4): 177-182.

Bellorin O, Lopes C, Martin L, Franco J, Romero C, Lopes L. Approaching to the social needs by the application of a strategic social plan. Salus Militae Journal. Dec 2003; 28(1): 26-35.

 

    Book Chapters

Bellorin-Marin O, Pomp A. (2017) Standard Bariatric Operations: Gastric Bypass. Global Bariatric Surgery, The Art of Weight Loss Across the Borders, 1st ed 

Saldinger  FP, Bellorin O. (2016) Natural History of Gallstones and Asymptomatic Gallstones. Jarnagin: Blumgart’s Surgery of the Liver, Biliary Tract, and Pancreas, 6th ed.

Sadinger FP, Bellorin O. (2016) Anatomy, Physiology, and Embriology of the biliary Tract.  Shackelford’s Surgery of the Alimentary Tract, 8th  ed

Kundel A, Bellorin O, (2016) Surgical management of pediatric endocrine diseases. Lavin : Manual of Endocrinology and Metabolism 5 tg ed.

 

    Publications

Video Session. SAGES Annual Meeting. Seattle, Wa (2018) Choi M, Bellorin-Marin O, Afaneh C. Robotic-Assisted Median Arcuate Ligament Release.

Video Session. SAGES Annual Meeting. Houston, Tx (2017) Bellorin O, Gray K, Afaneh C, Dakin G, Pomp A. Laparoscopic conversion of Toupet fundoplication to roux en y gastric bypass complicated with intraoperative necrosis of the gastric pouch in a morbidly obese patient with recurrent hiatal hernia 

Video Session. SAGES Annual Meeting. Houston, Tx (2017) Bellorin O, Gray K,  Dakin G, Pomp A, Afaneh C. Robotic resection of duodenal duplication cyst 

Video Session. SAGES Annual Meeting. Boston, MA (2016) Bellorin O, Shuchleib A, Zimmerman E, Du L, Addasi T. Modern Surgery Meets an Old Procedure: Laparoscopic Surgery for Peptic Ulcer Disease

Exhibit Hall Video Podium Presentation. SAGES Annual Meeting. Boston, MA (2016) Bellorin O, Shuchleib A, Zimmerman E, Du L, Addasi T. Laparoscopic Management of Technically Challenging Gastric GIST

Surgical Education Session. ACS Annual Clinical Congress. Chicago, IL (2015) Bellorin O, Ramirez-Valderrama A, Lee P. Heller Myotomy and Dor Fundoplication.  A Training Model for Advanced Laparoscopy.

Poster of Distinction. SAGES Annual Meeting. San Diego, CA (2012) Bellorin O, Ni M, Litong D. Surgical Management Of Gastrointestinal Stromal Tumors (Gist) Of The Stomach. Comparison Of Outcomes After Laparoscopic Versus Open Surgery.  The Most Recent NSQIP ACS Database

 Research Day. New York Hospital Queens.  Flushing, NY (2012) Bellorin O, Ni M, Litong D. Surgical Management Of Gastrointestinal Stromal Tumors (Gist) Of The Stomach. Comparison Of Outcomes After Laparoscopic Versus Open Surgery.  The Most Recent NSQIP ACS Database

Research Week. Cleveland Clinic Florida. Weston, FL (2010) Bellorin O, Abdemur A, Sucandy I, Szomstein S, Rosenthal R Understanding the significance, reasons and patterns of abnormal vital signs after gastric bypass for morbid obesity.

 Video session. SAGES Annual Meeting. Washington, DC (2010) Bellorin O, Court I, Szomstein S, Rosenthal R. Nine Steps to Follow for Safe and Standard Approach for Laparoscopic Paraesophageal Hernia Repair.

Video session. SAGES Annual Meeting. Washington, DC (2010) Court I, Bellorin O, Szomstein S, Rosenthal R. Laparoscopic Sleeve Gastrectomy as a Treatment Option for Acute Gastric Fundus Necrosis after Laparoscopic Redo Paraesophageal Hernia Repair And Slipped Redo Nissen Fundoplication.

III International Congress of Surgery. Caracas, Venezuela. (2008) Bellorin O, Sanchez A, Rodriguez O, Sanchez R, Paredes J. Use Of The Choledochoscope In The Laparoscopic Common Bile Duct Exploration.

LXXX Latin American Congress of Surgery FELAC. Santiago, Chile. (2006) Sanchez A, Bellorin O, Rodriguez O, Benitez G. Laparoscopic Appendectomy Unanimated Training Model.

1st Course in Laparoscopic Surgery. University Hospital of Caracas. Caracas, Venezuela. (2006) Bellorin O. Management And Care Of Laparoscopic Instrumental

 

    Videos

Shuchleib A, Bellorin O, Addasi T. (2016) Laparoscopic management of intestinal malrotation in the adult patient. International Congress of General Surgery. Merida, Yucatan-Mexico

Shuchleib A, Bellorin O, Addasi T. (2016) Hand assisted laparoscopic splenectomy as treatment option for splenic hemangioma with cavernomatous degeneration. International Congress of General Surgery. Merida, Yucatan-Mexico

Bellorin O, Abdemur A, Roy M, Szomstein S, Rosenthal R. (2011) Laparoscopic Proximal Gastrectomy with E-J Anastomosis as a treatment option for eroded nonadjustable Gastric Band. ACS Annual Clinical Congress. San Francico, CA 

Bellorin O, Court I, Abdemur A, Chousleb E, Szomstein S, Rosenthal R. (2011) Conversion of a previously reversed Roux en Y Gastric bypass to a Sleeve Gastrectomy. ACS Annual Clinical Congres. San Francisco, CA

Bellorin O, Court I, Fakulujo A, Chousleb E, Szomstein S, Rosenthal R. (2011) Mesh repair of large paraesophagial hernia after sleeve gastrectomy. ACS Annual Clinical Congress. San Francisco, CA

Bellorin O, Szomsein S, Rosenthal R. (2011) Laparoscopic conversion of obstructed sleeve gastrectomy to Roux-en-Y gastric Bypass. ACS Annual Clinical Congress. San Francisco, CA

Bellorin O, Court I, Szomstein S, Rosenthal R. (2010) Laparoscopic Conversion of Laparoscopic Adjustable Gastric Banding To Sleeve Gastrectomy For Morbid Obesity. SAGES Annual Meeting. Washington, DC

Hidalgo J, Bellorin O, Court I, Szomstein S, Rosenthal R. (2010) Diagnosis And Treatment Of Occult GI Bleeding After Laparoscopic Roux-En- Y Gastric Bypass. Case Report of a Gist as Bleeding Source. SAGES Annual Meeting. Washington, DC

Bellorin O, Court I, Fakulujo A,  Szomstein S, Rosenthal R. (2010) Laparoscopic Transection of Gastro-Gastric Fistula with Oversewing of Gastric Remnant and Pouch. ACS Annual Clinical Congress. Washington, DC

Bellorin O, Szomstein S, Rosenthal R. (2010) Laparoscopic Conversion of Sleeve Gastrectomy to Roux en Y Gastric Bypass for Acute Gastric Outlet Obstruction After Laparoscopic Sleeve Gastrectomy for Morbid Obesity. IFSO Congress. Los Angeles, CA

Court, Ismael, O Bellorin, A Fakulujo, SS Szomstein, RJ Rosenthal (2010) Laparoscopic Seromyotomy As A Treatment Option For Gastric Outlet Obstruction After Laparoscopic Sleeve Gastrectomy For Morbid Obesity. IFSO Congress. Los Angeles, CA

 

    Abstract/Poster Presentations

Juprasert Jackly M, Dimou Francesca M, Tufts Lauren, Bellorin O, Dakin G, Pomp A, Afaneh C. (2019) Learning Curve for Robotic Sleeve Gastrectomy, Roux-en-Y & One-Anastomosis Gastric Bypass. SAGES Annual Meeting. Baltimore, MD

Choi M, Moore M, Gray-Elmously K, Bellorin-Marin O, Dakin G, Pomp A, Zarnegar R, Afaneh C. (2018) Robotic Abdominal Wall Hernia Repairs: Technical Considerations and Lessons Learned. SAGES Annual Meeting. Seattle, Wa

Gray K, Bellorin O, Moore M, Dakin G, Afaneh C, Pomp A. (2017) Expect less: One year outcomes after conversion from adjustable band to sleeve gastrectomyn or gastric bypass versus primary procedures. Obesity Week Annual Meeting. Washington, DC

Gray, K , Moore M, Panjwani S, Bellorin O, Elmously A, Zarnegar R, Dakin G, Pomp A, Afaneh C. (2017) Perioperative Outcomes of Laparoscopic and Robotic Revisional Bariatric Surgery in a Complex Patient Population. SAGES Annual Meeting. Houston, TX 

Sharma, S, Bellorin O, Shuchleib A, Ricci J, Merola S. (2016) Endoscopic stent treatment for gastric sleeve leak: Effective strategy with intolerability in current series. Obesity Week Annual Meeting. New Orleans, LA 

Bellorin O, Sharma S, Shuchleib A, Satterfield J, Malik M, Addasi T. (2016) Improvement of basic surgical skills in Junior residents after programmed one-to-one training sessions with chief surgical resident. Research Day. New York Presbyterian Queens

Shuchleib A, Bellorin O, Hwang B, Du L. (2016) Gastric outlet obstruction and secondary small bowel obstruction secondary to…migrating tumor??? SAGES Annual Meeting. Boston, MA

Bellorin O, Ramirez-Valderrama A, Sharma S, Lee P. (2015) Construct Validity of a Training Model for Laparoscopic Heller Myotomy and Dor Fundoplication using the GOALS scale. SAGES Annual Meeting. Nashville, TN

Bellorin O, Ni M, Litong D. (2012) Surgical Management Of Gastrointestinal Stromal Tumors (Gist) Of The Stomach. Comparison Of Outcomes After Laparoscopic Versus Open Surgery.  The Most Recent NSQIP ACS Database. SAGES Annual Meeting. San Diego, CA

Mingwei Ni, MD PhD, Omar Bellorin-marin, MD, Alexander Kraev, MD, Kadar Oak, James Turner, MD, Litong Du, MD PhD. (2012) Assessment of Outcomes After Gastrectomy of Gastric Cancer in the United States. SAGES Annual Meeting. San Diego, CA

Kakarla V, Ruiz D, Dildeep A, Bellorin O, Tiszenkel H. (2010) Elective Laparoscopic Versus Open Colectomy For Symptomatic Diverticulosis - An Analysis Of ACS-NSQIP Database. SAGES Annual Meeting. Landover, MD

Court, Ismael, O Bellorin, A Fakulujo, SS Szomstein, RJ Rosenthal. (2010) Laparoscopic Seromyotomy As A Treatment Option For Gastric Outlet Obstruction After Laparoscopic Sleeve Gastrectomy For Morbid Obesity
Obes Surg 20 (8), 1029-1029.

Bellorin O, Court I., A Fakulujo, S Szomstein, RJ Rosenthal. (2010) Laparoscopic Transection Of Gastro-Gastric Fistula And Oversewing Of Gastric Remnant And Pouch. Obes Surg. 20 (8), 1029-1030

R Rosenthal, A Fakulujo, O Bellorin, Court, Ismael A., S Szomstein (2010) Laparoscopic Repair Of Hiatal Hernia And Band Slippage For Intractable Gastroesophageal Reflux Disease And Dysphagia. Obes Surg 20 (8), 1029-1029

 Lieb J, Sheetal Patel, Court I, Bellorin O, Chousleb E,  Szomstein S, Rosenthal R. (2010) Short terms outcomes comparing Roux -y gastric bypass vs. sleeve gastrectomy as treatment modalities for failed or complicated adjustable gastric banding. Surgery for Obesity and Related Diseases 6 (3), S23

Abdemur A, Court I, Berho M, Bellorin O, Rivero H, Li J, Szomsein S, Rosenthal R. (2010) Patterns of Ghrelin producing cells distribution and number in morbidly obese population. Surgery for Obesity and Related Diseases 2010; 6 (3):S52-S53.

Abraham Abdemur, Court I, Bellorin O, Berho M, Szomstein S, Rosenthal R. (2010) Patterns Of Ghrelin Producing Cells Distribution And Number In A Morbidly Obese Population. Florida chapter of ACS.  Miami, FL

Berho M, Bellorin O, Li J, Szomstein S, Rosenthal R. (2010) Ghrelin Cells in Obese and Non-Obese Patients: A pathological study on the number and distribution. Surgery for Obesity and Related Diseases; 2010; 6 (3):S53-S53

Bellorin O, Court I, Lieb J,  Szomstein S, Rosenthal R. (2010) Laparoscopic Conversion of Sleeve Gastrectomy To Roux-En-Y Gastric Bypass for Acute Gastric Outlet Obstruction After Laparoscopic Sleeve Gastrectomy for Morbid Obesity. ASMBS  Annual Meeting. Las Vegas, NV  

Sanchez A, Rodriguez O, Sanchez R, Benitez G, Bellorin O, Szomstein S. (2010) Laparoscopic Common Bile Duct Exploration And Current Management Of Common Bile Duct Stones. Experience At The University Hospital Of Caracas-Venezuela. SAGES Annual Meeting. Washington, DC

Sanchez A, Rodriguez O, Sanchez R, Benitez G, Bellorin O, Szomstein S. (2010) Training Model For Laparoscopic Common Bile Duct Exploration. Impact In The Improvement Of Surgical Skills. SAGES Annual Meeting. Washington,  DC

Bellorin O, Jimenez R, Herrera K. (2000) PPD And Its Diagnostic Usefulness In the Casuistic of Tuberculosis in patients More Than 15 years old. XV Scientist International Conference of Latin American Federation of Medical Students. Asuncion - Paraguay.

Gimenez R, Bellorin O, Herrera K. (2000) Relationship Between Tuberculosis And Associated Condition. Retrospective Study. XV Scientist International Conference of Latin American Federation of Medical Students. Asuncion - Paraguay.

Gonzales F, Bellorin O, Diaz L, Diaz M. (2000) Attention And Memory Characteristics In Healthy Subjects. XV Scientist International Conference of Latin American Federation of Medical Students. Asuncion - Paraguay.