1. Division of Nephrology, Department of Medicine, Centro Hospitalar de Trás-os-Montes e Alto Douro , Vila Real , Portugal
2. Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic College of Medicine and Science , Rochester, MN , USA
3. Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Mayo Clinic College of Medicine and Science , Rochester, MN , USA