Department of Respiratory Medicine, 1st Affiliated Hospital of Medical College of Shantou University, Shantou 515031, China;
Department of Respiratory Medicine, 1st Affiliated Hospital of Medical College of Shantou University, Shantou 515031, China;
Department of Respiratory Medicine, 1st Affiliated Hospital of Medical College of Shantou University, Shantou 515031, China;
Department of Respiratory Medicine, 1st Affiliated Hospital of Medical College of Shantou University, Shantou 515031, China;
Department of Respiratory Medicine, 1st Affiliated Hospital of Medical College of Shantou University, Shantou 515031, China;