1. Department of Science and Education, Shijiazhuang Maternity and Child
Healthcare Hospital, Shijiazhuang, China
2. Department of Infection Control Division, Shijiazhuang Maternity and
Child Healthcare Hospital, Shijiazhuang, China
3. Department of Internal Medicine, Shijiazhuang Third Hospital,
Shijiazhuang, China
4. Department of Obstetrics and Gynecology, Ningjin County Maternity and
Child Healthcare Hospital, Xingtai, China
5. Department of Internal Medicine, Shijiazhuang Maternity and Child
Healthcare Hospital, Shijiazhuang, China