1. Insitute of Informatics, Federal University of Rio Grande do Sul - UFRGS, Brazil
2. Diretoria de Ensino, Hospital de Clínicas de Porto Alegre, Brazil and Faculdade de Medicina, Federal University of Rio Grande do Sul - UFRGS, Brazil
3. Insitute of Informatics, Federal University of Rio Grande do Sul - UFRGS, Brazil and Instituto Superior Técnico, University of Lisbon, Portugal