The effectiveness of zinc supplementation in men with isolated hypogonadotropic hypogonadism oleh Yan-Ling Liu, Man-Na Zhang, Guo-Yu Tong, Shou-Yue Sun, Yan-Hua Zhu, Ying Cao, Jie Zhang, Hong Huang, Ben Niu, Hong Li, Qing-Hua Guo, Yan Gao, Da-Long Zhu, Xiao-Ying Li, on behalf of Hypogonadotropic Hypogonadism Intervention Study (HHIS) Group