1. Department of Respiration, First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease, Bengbu, Anhui, P.R. China
2. Department of Intensive Care Unit, Zaozhuang Municipal Hospital, Zaozhuang, Shandong, P.R. China
3. Department of Cardiology, First Municipal Hospital of Bengbu, Bengbu, Anhui, P.R. China