Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H28-Seishin- Ippan-002)
Intramural Research Grants for Neurological and Psychiatric Disorders (1-2)
Accepted: 16 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the Ethics Committee of the NCNP in Japan (A2016–022). Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.