Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H27-Sinkougyousei-Shitei-001)
Received: 20 April 2019
Accepted: 17 January 2020
First Online: 28 January 2020
Ethics approval and consent to participate
: Data of reports of STD cases were collected in the NESID in Japan. We only used count data (without any personally identifiable information), so no ethical review was needed.
: Not applicable.
: The authors declare that they have no competing interests.