Article info
PDFResearch methods
Protocol
Validity of peptic ulcer disease and upper gastrointestinal bleeding diagnoses in administrative databases: a systematic review protocol
- Correspondence to Dr Iosief Abraha; iosief_a{at}yahoo.it
Citation
Validity of peptic ulcer disease and upper gastrointestinal bleeding diagnoses in administrative databases: a systematic review protocol
Publication history
- Received March 4, 2016
- Revised June 16, 2016
- Accepted June 20, 2016
- First published September 15, 2016.
Online issue publication
May 15, 2023
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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/ This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/