Funding for this research was provided by:
Center Administrative Expense from Nara Medical University
Japan Society for the Promotion of Science (JP17K09209)
Article History
Received: 12 October 2020
Accepted: 11 February 2021
First Online: 4 March 2021
Ethics approval and consent to participate
: In this study, we received approval of use for academic purposes from the Japanese Ministry of Health, Labour and Welfare (approval number 17003), based on Article 36 of the Statistics Law of Japan. The data provided had personally identifiable information removed.
: Not applicable.
: KS received research grants from YKK AP Inc.; Ushio Inc.; Tokyo Electric Power Company; EnviroLife Research Institute Co., Ltd.; Sekisui Chemical Co., Ltd.; LIXIL Corp.; and KYOCERA Corp. This does not alter our adherence to Harm Reduction Journal’s policies on sharing data and materials. KT and MS declare no competing interests.