[1
]
State Key Laboratory of Respiratory Disease, National Clinical Research Center for
Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated
Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.
[2
]
Department of Respiratory and Critical Care Medicine, First Affiliated Hospital of
Zhengzhou University, Zhengzhou, Henan, China.
[3
]
Guangzhou First People's Hospital, Guangzhou, Guangdong, China.
[4
]
State Key Laboratory of Respiratory Disease, National Clinical Research Center for
Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated
Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China. nanshan@vip.163.com
chenrc@vip.163.com.