Li, Jun, and He-Yi Zheng. “Early Syphilis: Serological Treatment Response to Doxycycline Tetracycline Versus Benzathine Penicillin”. The Journal of Infection in Developing Countries 8, no. 02 (February 13, 2014): 228–232. Accessed April 25, 2024. https://jidc.org/index.php/journal/article/view/24518634.