1. Department of Gynaecology and Obstetrics, Shandong Provincial Maternal and Child Health Care Hospital Affiliated to Qingdao University, Jinan, China
2. Department of Ultrasound, Shandong Provincial Maternal and Child Health Care Hospital Affiliated to Qingdao University, Jinan, China
3. Obstetrics and Gynecology Clinical Pharmacist, Shandong Provincial Maternal and Child Health Care Hospital Affiliated to Qingdao University, Jinan, China