hat
Retrieved 29 January 2015. ↑ Gong, Ting-Ting; Wu, Qi-Jun; Vogtmann, Emily; Lin, Bei; Wang, Yong-Lai (2013-06-15). « Age at menarche and risk of ovarian cancer: a meta-analysis of epidemiological studies ».
eng
Retrieved 29 January 2015. ↑ Gong, Ting-Ting; Wu, Qi-Jun; Vogtmann, Emily; Lin, Bei; Wang, Yong-Lai (2013-06-15). "Age at menarche and risk of ovarian cancer: a meta-analysis of epidemiological studies".