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Qi, Zhen-Yu, Chuan Shao, Xin Zhang, Guo-Zhen Hui, and Zhong Wang. “Exogenous and Endogenous Hormones in Relation to Glioma in Women: A Meta-analysis of 11 Case-Control Studies.” PloS One 8, no. 7 (2013): e68695. doi:10.1371/journal.pone.0068695.