Department of Male Clinic Research, National Research Institute for Family Planning, Beijing 100081, China;
Fucheng Technical Service Center of Family Planning,Fucheng, Hebei 053700,China;
Department of Male Clinic Research, National Research Institute for Family Planning, Beijing 100081, China;
Department of Male Clinic Research, National Research Institute for Family Planning, Beijing 100081, China;
Department of Male Clinic Research, National Research Institute for Family Planning, Beijing 100081, China;
Department of Male Clinic Research, National Research Institute for Family Planning, Beijing 100081, China;
Department of Male Clinic Research, National Research Institute for Family Planning, Beijing 100081, China;
Fucheng Technical Service Center of Family Planning,Fucheng, Hebei 053700,China;
Fucheng Technical Service Center of Family Planning,Fucheng, Hebei 053700,China;
Fucheng Technical Service Center of Family Planning,Fucheng, Hebei 053700,China;