1. Department of Intensive Care Unit and Yuhuangding Hospital Affiliated to Qingdao University, Yantai, P.R. China.
2. Department of Emergency, Yuhuangding Hospital Affiliated to Qingdao University, Yantai, P.R. China.
3. Department of Gynecology and Obstetrics, Penglai Traditional Chinese Medicine Hospital, Yantai, P.R. China.