Postural flexibility during quiet standing in healthy elderly and patients with Parkinson's disease. - Kazuyuki Matsuda; Yasuyuki Suzuki; Naoya Yoshikawa; Tomohisa Yamamoto; Ken Kiyono; Takao Tanahashi; Takuyuki Endo; Kei Fukada; Kunihiko Nomura; Saburo Sakoda; Taishin Nomura (EMBC, 2016)