Fevereiro, T., S. Afonso, E. Lozano, A. Ribeirinho, J. Calado, R. Matos, and H. Brazão. “Cost Evaluation During 2002 in a Medicine/ Immunodeficiency Hospital Outpatient Attendance”. Internal Medicine, vol. 16, no. 2, June 2009, pp. 72-75, https://revista.spmi.pt/index.php/rpmi/article/view/1390.