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Office
9701 SW Barnes Rd
Ste 300
Portland, OR 97225Phone+1 503-297-8081Fax+1 503-292-6601
Education & Training
- Duke University HospitalFellowship, Gastroenterology, 1991 - 1995
- Icahn School of Medicine at Mount Sinai/Mount Sinai HospitalResidency, Internal Medicine, 1987 - 1990
- Albert Einstein College of MedicineClass of 1987
Certifications & Licensure
- OR State Medical License 2003 - 2025
- TN State Medical License 1997 - 2003
- DC State Medical License 1995 - 1998
- NY State Medical License 1988 - 1992
- American Board of Internal Medicine Gastroenterology
Awards, Honors, & Recognition
- America's Top Doctors Castle Connolly, 2011-2014
- Portland Monthly Magazine Castle Connolly, 2011
- Meaningful Use Stage 1 Certification Centers for Medicare & Medicaid Services, 2011
Clinical Trials
- Evaluation of the PillCam™ Colon Capsule Endoscopy (PCCE) in the Visualization of the Colon Start of enrollment: 2006 Jun 01
- "Evaluation of the PillCam™ESO Capsule in the Detection of Esophageal Varices Start of enrollment: 2004 Dec 01
- Study of Endoscopic Barrett's Esophagus Diagnosis Start of enrollment: 2007 Dec 01
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Publications & Presentations
PubMed
- Quality indicators for capsule endoscopy and deep enteroscopy.Jonathan A Leighton, Andrew S Brock, Carol E Semrad, David J Hass, Nalini M Guda
Gastrointestinal Endoscopy. 2022-11-01 - 12 citationsQuality Indicators for Capsule Endoscopy and Deep Enteroscopy.Jonathan A Leighton, Andrew S Brock, Carol E Semrad, David J Hass, Nalini M Guda
The American Journal of Gastroenterology. 2022-11-01 - 20 citationsBenchmarking Adenoma Detection Rates for Colonoscopy: Results From a US-Based Registry.Aasma Shaukat, Jennifer L. Holub, Irving M. Pike, Mark Pochapin, David A. Greenwald
The American Journal of Gastroenterology. 2021-09-01
Authored Content
- Infection Control During GI EndoscopyMarch 2018
- Infection Control During GI EndoscopyMarch 2018
Press Mentions
- Gastro Health to Be Sold, CRH Medical to Be Acquired — 4 GI Industry NotesFebruary 10th, 2021
- Meet the New President of the GI Quality Improvement Consortium: Dr. Costas KefalasFebruary 8th, 2021
- Leadership Change at the GI Quality Improvement Consortium, Inc. (GIQuIC)February 3rd, 2021
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