1. Department of Pulmonary and Critical Care Medicine, Shengjing Hospital of China Medical University, Shenyang 110004, China
2. Department of Gastroenterology Medicine, Shengjing Hospital of China Medical University, Shenyang 110004, China
3. Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Shenyang 110004, China
4. Sleep Medicine Center, Shengjing Hospital of China Medical University, Shenyang 110004, China