Cardoso, Ana Rita, Cristina Gonçalves, Dulce Pascoalinho, Carla Gil, António Fernandes Ferreira, Inês Bártolo, and Nuno Taveira. 2003. “A Clinical Case of Seronegative AIDS”. Portuguese Journal Internal Medicine 10 (3). Lisboa, Portugal:153-56. https://revista.spmi.pt/index.php/rpmi/article/view/1816.