Citation:
Amegadzie JE, Badejo O, Gamble J-M, Wright M, Farrell J, Jackson B, et al. BMJ Open. Validated methods to identify patients with asthma-COPD overlap in healthcare databases: A systematic review protocol [Internet]. 2019;Available from: http://www.scopus.com/inward/record.url?eid=2-s2.0-85062922942&partnerID=MN8TOARS