Secular trends for age at spermarche among Chinese boys from 11 ethnic minorities, 1995–2010: a multiple cross-sectional study | BMJ Open

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Secular trends for age at spermarche among Chinese boys from 11 ethnic minorities, 1995–2010: a multiple cross-sectional study

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Cite this article as:: Song Y, Ma J, Li L, et al

Secular trends for age at spermarche among Chinese boys from 11 ethnic minorities, 1995–2010: a multiple cross-sectional study

BMJ Open 2016;6:e010518. doi: 10.1136/bmjopen-2015-010518