1. Department of Anesthesiology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
2. Department of Obstetrics and Gynecology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
3. Department of Gastroenterology and Hepatology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China