S., Sivakumar, and Banupriya K. “A Retrospective Observational Comparative Study of VDRL Vs. TPHA and Their Role in Serodiagnosis of Syphilis in a Tertiary Care Centre”. International Journal of Research in Dermatology 3, no. 3 (August 24, 2017): 444–447. Accessed April 16, 2026. https://www.ijord.com/index.php/ijord/article/view/222.