1. Pharmacology Dept., Centre for Research and Advanced Studies National Polytechnic Institute, Mexico
2. Physiology, Biophysics and Neurosciences Dept., Centre for Research and Advanced Studies National Polytechnic Institute, Mexico
3. Dept. of Nephrology, Hospital Central Norte de PEMEX, Mexico
4. Unidad Medica Alta Especialidad, Hospital General la Raza, Instituto Mexicano del Seguro Social (IMSS), Mexico
5. Dept. of Nephrology, Hospital Regional No. 1 del IMSS, Mexico
6. Dept. of Nephrology, Hospital Juarez de Mexico, Mexico