1. Oncology Division, Nossa Senhora da Conceição Hospital, Porto Alegre, RS, Brazil
2. Postgraduation Program in Medicine and Medical Sciences, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcellos 2400, 90035-003 Porto Alegre, RS, Brazil
3. Internal Medicine Division, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcellos 2350/700, 90035-003 Porto Alegre, RS, Brazil