1. Department of Physical Examination Center, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
2. Department of Gynecology and Obstetrics, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
3. Department of Quality Control, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, China (mainland)