Gómez, Juan Fidel Bencomo, et al. “Comparison of the Collection of Blood Samples in Prenatal Screening, Using the Filter Paper and Venipuncture Technique ELISA for the Detection of HIV 1+2”. Brazilian Journal of Sexually Transmitted Diseases, vol. 22, no. 4, Oct. 2010, pp. 193-8, https://bjstd.org/revista/article/view/1106.