Mao, Y., Lian, Q., Zuo, X., Zhang, Y., Luo, S., Zhang, S., … Zhou, W. (2018). Validity of self-reported age at menarche in computer-assisted interview among Chinese schoolgirls: a cross-sectional study. BMJ Open, 8(1), e016799. https://doi.org/10.1136/bmjopen-2017-016799 (Original work published 2018)