1 Dept of Respiratory and Critical Care Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
2 Institute of Respiratory Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
3 Co-first author.
4 Dept of Respiratory and Critical Care Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China liqingyun68@hotmail.com.