Funding for this research was provided by:
Japan Agency for Medical Research and Development (JP19ek0109346, JP19ek0109356, JP19ek0109394)
Ministry of Health, Labour and Welfare (19FC1007)
Received: 22 June 2019
Accepted: 24 September 2019
First Online: 21 October 2019
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of St. Marianna University School of Medicine (# 2044). Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.