Nahas, S.C. et al. 1999. Orifice diseases project - experience of the "Hospital das Clínicas" University of São Paulo Medical Center in day-hospital of anorectal disease . Revista do Hospital das Clínicas. 54, 3 (Jun. 1999), 75–80. DOI:https://doi.org/10.1590/S0041-87811999000300002.