Christo, Paulo Pereira, et al. “ Analysis of Correlation Between Cerebrospinal Fluid and Plasma HIV-1 RNA Levels in Patients With Neurological Opportunistic Diseases ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 53, no. 4, Aug. 2011, pp. 193-6, https://www.revistas.usp.br/rimtsp/article/view/31404.