Funding for this research was provided by:
Grant-in-Aid Challenging Exploratory Research (25670254)
Grant-in-Aid for Challenging Exploratory Research (16K15313)
Received: 20 February 2019
Accepted: 14 June 2019
First Online: 2 July 2019
Ethics approval and consent to participate
: This study was approved by the Clinical Ethical Review Board of Kurume University, School of Medicine (Ethics approval number: 13138). Prior to the investigation, participants were provided with explanations via the Internet as to the purpose and method of the study as well as information regarding the handling of the results. The study was conducted upon receiving participants signed consent online.
: Not applicable.
: The authors declare that they have no competing interests.