Funding for this research was provided by:
the Japan Agency for Medical Research and Development (19fm0108001)
Received: 30 July 2019
Accepted: 30 December 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: The study was approved both by the Human Research Ethics Committee of the National Center for Global Health and Medicine (reference: NCGM-G-002537-01) and by the Bio-medical Research Ethics Committees of National Hospital for Tropical Diseases (reference:08/HDDD-NDTU). We performed this study in accordance with the Japan Ethical Guidelines for Medical and Health Research Involving Human Subjects issued by the Japanese Ministry of Health, Labour and Welfare. Each participant provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.