Correction to: Remarkable clinical responses of non-fluctuating Parkinson's disease (PD) after alternating catechol O-methyltransferase inhibitors: case series switching from entacapone 200 ~ 300 mg/day to opicapone 25 mg/day
1 Department of Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan. nakamagoek@md.tsukuba.ac.jp.
2 Department of Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.