Daniel Holguín-Ruacho, Servicio de Cirugía General, Hospital General Dr. Salvador Zubirán Anchondo, Chihuahua, Chihuahua, México
Carlos R. Cervantes-Sánchez, Department of Surgery, Escuela de Medicina, Mexico City; Department of Surgery, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), Mexico City; General Surgery Service, Hospital General de Chihuahua “Dr. Salvador Zubirán Anchondo”, Chihuahua. Mexico