1. Department of Respiratory & Critical Care Medicine, Changhai Hospital, Navy Military Medical University, No. 168 Changhai RD, Yangpu District, Shanghai, P.R. China
2. Department of General Practice Teaching & Research Office, Changhai Hospital, Navy Military Medical University, No. 168 Changhai RD, Yangpu District, Shanghai, P.R. China
3. Department of Clinical Laboratory, Changhai Hospital, Navy Military Medical University, No. 168 Changhai RD, Yangpu District, Shanghai, P.R. China