Zeng Xiang-Yi, Wang Xiao-Ping, He Shun-Ping, Li Qiu-Lian, Wu Jian-Feng
Deparment of Respiratory Medicine, Shaoguan First People's Hospital, the Shaoguan Hospital Affiliated to Guangdong Medical College, Shaoguan 512000, Guangdong, China.
Zhongguo Wei Zhong Bing Ji Jiu Yi Xue. 2007 Sep;19(9):558-9.