1. Ecology of Pathogenic Agents, Division of Research, General Hospital Dr. Manuel Gea González, Mexico
2. Department of Dermatology, General Hospital Dr. Manuel Gea González, Mexico
3. Department of Transplant, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
4. Department of Internal Medicine, Fundación Clínica Médica Sur A.C, Mexico