Ishikane, M., Arima, Y., Itoda, I., Yamagishi, T., Takahashi, T., Matsui, T., Sunagawa, T., Ohnishi, M. and Oishi, K. 2019. Case-control study of risk factors for incident syphilis infection among men who have sex with men in Tokyo, Japan. Western Pacific Surveillance and Response. 10, 4 (Dec. 2019). DOI:https://doi.org/10.5365/wpsar.2019.10.1.003.