Daniel Holguín-Ruacho, Servicio de Cirugía General, Hospital General Dr. Salvador Zubirán Anchondo, Chihuahua, Chihuahua, México
Carlos R. Cervantes-Sánchez, General Surgery Service, Chihuahua City General Hospital “Dr. Salvador Zubirán Anchondo”; Department Educational Research, Faculty of Medicine and Biomedical Sciences, Autonomous University of Chihuahua. Chihuahua, Mexico