1. Department of Nuclear Medicine, Hubei Provincial Clinical Research Center for Umbilical Cord Blood Hematopoietic Stem Cells, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, Hubei, China
2. Department of Critical Care Medicine, Danjiangkou First Hospital, Danjiangkou 420381, Hubei, China
3. Department of Medical Ultrasound, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, Hubei, China
4. Department of Obstetrics and Gynecology, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, Hubei, China