2 1Department of Respiratory Medicine, People’s Hospital of Ningxia Hui Autonomous Region, Yinchuan, People’s Republic of China; 2Department of Respiratory Medicine, First Affiliated Hospital of Northwest Minzu University, Yinchuan, People’s Republic of China; 3Department of Intervention and Vascular Surgery, People’s Hospital of Ningxia Hui Autonomous, Yinchuan, People’s Republic of China; 4Department of Intervention and Vascular Surgery, First Affiliated Hospital of Northwest Minzu University, Yinchuan, People’s Republic of China *These authors contributed equally to this work Correspondence: Bing Zhuan Department of Respiratory Medicine, First Affiliated Hospital of Northwest Minzu University, No. 301 Zhengyuan North Street, Jinfeng District, Yinchuan, 750004, People’s Republic of China