Altered body composition, sarcopenia, frailty, and their clinico-biological correlates, in Parkinson's disease by Tan, Ai Huey, Hew, Yin Cheng, Lim, Shen Yang, Mohd Ramli, Norlisah, Kamaruzzaman, Shahrul Bahyah, Tan, Maw Pin, Grossmann, Mathis, Ang, Ban Hong, Tan, Jiun Yan, Manap, Mohamad Addin Azhan A., Tay, Tun Khong, Tan, Siang Lyn, New, Ru Peng, Fadzli, Farhana, Yee, Eng Jui, Moy, Foong Ming, Mahadeva, Sanjiv, Lang, Anthony E.