Validated methods to identify patients with asthma-COPD overlap in healthcare databases: a systematic review protocol.
Joseph Emil AmegadzieOluwatosin BadejoJohn-Michael GambleMark WrightJamie FarrellBrooke JacksonKirin SultanaMaimoona HashmiZhiwei GaoPublished in: BMJ open (2019)
CRD42018087472.