Air Force Institute of Aviation Medicine, Beijing 100142,China;
Department of Reproductive Endocrinology, National Research Institute for Family Planning, Beijing 100081, China;
Air Force Institute of Aviation Medicine, Beijing 100142,China;
Department of Dermatology, The General Hospital of the Air Force, Beijing 100042, China;
Department of Reproductive Endocrinology, National Research Institute for Family Planning, Beijing 100081, China;