Institute of Child and Adolescent Health, School of Public Health, Peking University, National Health Commission Key Laboratory of Reproductive Health, Beijing, China. Department of Sport, Physical Education & Health, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China. Laboratory of Exercise Science and Health, BNU-HKBU United International College, Zhuhai, China. School of Nursing, Peking University, Beijing, China. Peking University First Hospital, Beijing, China. School of Public Health and Management, Ningxia Medical University, Key Laboratory of Environmental Factors and Chronic Disease Control, Yinchuan, China.