Chi Chunhua, Sheikh Aziz, Yao Mi, Cheng Kar Keung, Wang Chen
Department of Respiratory and Critical Care Medicine, Peking University First Hospital, Beijing, China; Department of General Practice, Peking University Health Science Center, Beijing, China.
Asthma UK Centre for Applied Research, Usher Institute of Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK.
Lancet Respir Med. 2015 Nov;3(11):e35. doi: 10.1016/S2213-2600(15)00439-7.