1. Department of 1Respiratory Medicine, Ruijin Hospital, Medical School of Shanghai Jiaotong University, Shanghai
2. Department of Respiratory Medicine, Sir Run Run Shaw Hospital, Medical School of Zhejiang University, Hangzhou, China
3. Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai; and
4. Department of 4Gastroenterology, Ruijin Hospital, Medical School of Shanghai Jiaotong University, Shanghai;