Funding for this research was provided by:
Ministry of Health, Labour and Welfare
Text and Data Mining valid from 2018-10-17
Received: 8 June 2018
Accepted: 15 October 2018
First Online: 17 October 2018
Compliance with ethical standards
: All procedures performed in studies 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. This study was approved by the Ethics Committee of Nihon University School of Medicine.
: Informed consent was obtained from all individual participants included in the study.
: Y. Otsuka, Y. Kaneita, O. Itani, Y. Osaki, S. Higuchi, H. Kanda, S. Nakagome, M. Jike, and T. Ohida declare that they have no conflicts of interest.