1. Shanxi Medical University, Taiyuan, People’s Republic of China
2. Wuhan University, Wuhan, Hubei, People’s Republic of China
3. Globe Health Center of Wuhan University, Wuhan, Hubei, People’s Republic of China
4. Hubei Province Family Planning Technology Service Center, Wuhan, Hubei, Peoples’ Republic of China
5. Xuanwu Hospital, Capital Medical University, Beijing, People’s Republic of China