Physical activity and sleep pattern in relation to incident Parkinson's disease: a cohort study by Li-Hua Chen, Shi-Yu Sun, Guijie Li, Xiang Gao, Weifeng Luo, Haili Tian, Xuanhao Zhang, Xi Yin, Ziwei Liu, Guo-Chong Chen, Guangfei Xu, Tong Liu, Fu-Rong Li

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