1 Department of Pulmonary and Critical Care Medicine, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, China.
2 Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada.
3 Department of Community Health and Epidemiology, Dalhousie University, Halifax, NS, Canada.
4 ArtiQ NV, Leuven, Belgium.
5 Department of Pulmonary and Critical Care Medicine, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, China liqressh@hotmail.com.