1 Department of Pulmonary and Critical Care Medicine, the Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China; Research Unit of Respiratory Disease, Central South University, Changsha, Hunan 410011, China; Hunan Diagnosis and Treatment Center of Respiratory Disease, Changsha, Hunan 410011, China.
2 Changsha KingMed Center for Clinical Laboratory, Changsha, Hunan 410005, China.
3 Changsha KingMed Center for Clinical Laboratory, Changsha, Hunan 410005, China. Electronic address: hn-yuyan@kingmed.com.cn.
4 Department of Pulmonary and Critical Care Medicine, the Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China; Research Unit of Respiratory Disease, Central South University, Changsha, Hunan 410011, China; Hunan Diagnosis and Treatment Center of Respiratory Disease, Changsha, Hunan 410011, China. Electronic address: luohonghuxi@csu.edu.cn.