Article info
PDFEpidemiology
Protocol
Validated methods to identify patients with asthma–COPD overlap in healthcare databases: a systematic review protocol
- Correspondence to Dr Zhiwei Gao; zhiwei.gao{at}med.mun.ca
Citation
Validated methods to identify patients with asthma–COPD overlap in healthcare databases: a systematic review protocol
Publication history
- Received May 21, 2018
- Revised September 26, 2018
- Accepted December 31, 2018
- First published March 13, 2019.
Online issue publication
January 05, 2023
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Copyright information
© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. 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, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.