1. Nephrology Department, Centro Hospitalar Universitário do Algarve, 8000 Faro, Portugal
2. Nephrology Department, Centro Hospitalar Universitário de Coimbra, 3004 Coimbra, Portugal
3. Nephrology Department, Centro Hospitalar de Lisboa Ocidental, 2790 Lisboa, Portugal
4. Nephrology Department, Centro Hospitalar Universitário de Santo António, 4050 Porto, Portugal
5. Nephrology Department, Instituto Português de Oncologia do Porto, 4200 Porto, Portugal