1. IDWR Surveillance Data Table Infectious Agents Surveillance Report http://idsc.nih.go.jp/idwr/ydata/report-Ea.html
2. Sexually transmitted diseases in Japan as of 2007 Infectious Agents Surveillance Report http://idsc.nih.go.jp/iasr/29/343/tpc343.html
3. Resurgent bacterial sexually transmitted disease among men who have sex with men - King County, Washington, 1997-1999;Centers for Disease Control and Prevention;MMWR Morb Mortal Wkly Rep,1999
4. Outbreak of syphilis among men who have sex with men - Southern California, 2000;Centers for Disease Control and Prevention;MMWR Morb Mortal Wkly Rep,2001
5. Primary and secondary syphilis among men who have sex with men - New York City, 2001;Centers for Disease Control and Prevention;MMWR Morb Mortal Wkly Rep,2002