Gilberto Pires da Rosa1, Ester Ferreira2. 1. Autoimmune Diseases Consultation, Department of Internal Medicine, Hospital Lusíadas Porto, and Faculty of Medicine, University of Porto, Portugal. gilbertopiresrosa@gmail.com. 2. Faculty of Medicine, University of Porto, and Autoimmune Diseases Group, Department of Internal Medicine, Centro Hospitalar Universitário de São João, Porto, Portugal.