1. Internal Medicine Service, Regional General Hospital of Zone 1, “Morelos” Unit, Mexican Institute of Social Security, 500 Universidad Av, Colonia San Felipe I Etapa, PC 31217, Chihuahua, Chih., México
2. 2Year Medical Student, School of Medicine, University of Durango Campus Chihuahua, 9501-5 La Cantera Av Prolong, Ejido La Haciendita, PC 31210, Chihuahua, Chih., México