F M A Basilio1, B Werner2, F Mulinari-Brenner1. 1. Department of Internal Medicine, Federal University of Parana (HC-UFPR), Rua General Carneiro 181, 80060 900, Curitiba, PR, Brazil. 2. Department of Pathology, Federal University of Parana (HC-UFPR), Rua General Carneiro 181, 80060 900, Curitiba, PR, Brazil.