1. Medical Examination Center, Peking University Third Hospital, Beijing, China
2. Rehabilitation Medicine Department, Peking University Third Hospital, Beijing, China
3. Nursing Department, Peking University Third Hospital, Beijing, China
4. Research Center of Clinical Epidemiology, Peking University Third Hospital, Beijing, China
5. School of Nursing, Peking University, Beijing, China
6. Reproductive Medicine Centre, Peking University Third Hospital, Beijing, China