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

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