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Tu, Xiangdong, Hui Cai, Yu-Tang Gao, Xiaoyan Wu, Bu-Tian Ji, Gong Yang, Honglan Li, Wei Zheng, and Xiao Ou Shu. Sleep Duration and Its Correlates in Middle-aged and Elderly Chinese Women: The Shanghai Women’s Health Study. 2012.

Tu, Xiangdong, et al. Sleep Duration and Its Correlates in Middle-aged and Elderly Chinese Women: The Shanghai Women’s Health Study. 2012.