1. Renal Division, Department of Medicine Brigham and Women's Hospital Boston Massachusetts USA
2. Harvard Medical School Boston Massachusetts USA
3. Kidney Specialists of Central Oklahoma Oklahoma City Oklahoma USA
4. Department of Endocrinology, Diabetes and Metabolism, Centro Hospitalar Universitário de São João, Faculdade de Medicina Universidade do Porto Porto Portugal
5. Departamento de Cirurgia e Fisiologia Unidade de Investigação Cardiovascular, Faculdade de Medicina, Universidade do Porto Porto Portugal
6. Renal Section, Department of Medicine Boston University Medical Center Boston Massachusetts USA