Association between age of first spermatorrhea and physical activity or sleeping time in boys
PENG Lin-li, WANG Hong, HE Fang, CHENG Xu-ting, WANG ling-yi, JIANG Jia-jia
上海交通大学学报（医学版） . 2017, (3): 394 .  DOI: 10.3969/j.issn.1674-8115.2017.03.023