Poor sleep quality is associated with fatigue and depression in early Parkinson's disease: a longitudinal study in the PALS cohort by Koh, Matthew Rui En, Chua, Cong Yang, Ng, Samuel Yong-Ern, Chia, Nicole Shuang-Yu, Saffari, Seyed Ehsan, Chen, Regina Yu-Ying, Choi, Xinyi, Heng, Dede Liana, Neo, Shermyn Xiumin, Tay, Kay Yaw, Au, Wing Lok, Tan, Eng-King, Tan, Louis Chew-Seng, Xu, Zheyu

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