1. Nephrology Division, Hospital Nacional Arzobispo Loayza, Lima, Perú.
2. Department of Medicine, Universidad Peruana Cayetano Heredia, Lima, Perú.
3. Nephrology Division, Hospital Regional Honorio Delgado, Arequipa, Perú.
4. Nephrology Division, Hospital Nacional Adolfo Guevara Velasco, Cuzco, Perú.
5. Nephrology Division, Hospital Nacional Daniel Alcides Carrion, Callao, Perú.