1 1 Post-Graduation Medical Sciences Program: Endocrinology, School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil. 2 Post-Graduation Medicine Program: Medical Sciences, School of Medicine, Department of Internal Medicine, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil. 3 Division of Nephrology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil. 4 Nutrition Course, School of Medicine, Department of Internal Medicine, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.