- Correspondence to Professor Hui Zeng, Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Jingshundongjie 8, Beijing 100015, China; and Professor Yongchang Sun, Department of Respiratory Medicine, Beijing Tongren Hospital, Capital Medical University, No. 1 Dongjiaominxiang, Dongcheng District, Beijing 100730, China;
- Received March 23, 2012
- Revised April 28, 2013
- Accepted May 10, 2013
- First published June 7, 2013.
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