Funding for this research was provided by:
Japan Society for the Promotion of Science (18K17369)
Institute for Health Economics and Policy (Not Applicable)
Text and Data Mining valid from 2020-04-28
Received: 18 November 2019
Accepted: 27 March 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: This study was approved by the institutional ethical review board of the Institute of Tropical Medicine, Nagasaki University (Japan) and conducted in accordance with the approved guideline. Written informed consent was obtained by each participant before starting the survey through an electronic form and the ethical review board approved this form of consent.
: Not applicable.
: All the authors declare that they have no potential conflicts of interest. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed.