Funding for this research was provided by:
“Health and Labor Sciences Research Grants for Comprehensive Research on Persons with Disabilities” from Japan Agency for Medical Research and Development, AMED
Intramural Research Grant (29-1) for Neurological and Psychiatric Disorders of NCNP
Text and Data Mining valid from 2018-02-13
Received: 26 July 2017
Accepted: 29 January 2018
First Online: 13 February 2018
Compliance with ethical standards
: Takashi Kikuchi, a member of Translational Research Information Center, was consulted for statistical analysis but was not involved in writing the manuscript or collecting data. Other authors have no conflict of interest in this study.
: All the procedures undertaken to perform experiments involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all the participants included in this study.