Ferreira, Cristina M., William A. Ferreira, Cecília L. Motta, Felicien G. Vasquez, and Alaney F. Pinto. 2006. “Reactivity of VDRL Test in Bloodbags of the Amazon Hematology and Hemoterapy Foundation-Hemoam, the Decurrent Costs of Discharge and Estimative of Syphilis Prevalence in Blood Donnors of the Amazon State”. Brazilian Journal of Sexually Transmitted Diseases 18 (1). Niterói:14-17. https://bjstd.org/revista/article/view/604.