1. Pediatric Intensive Care Department, Pediatric Hospital University Dr. Eduardo Agramonte Piña, Dolores Betancourt No. 2, e/Domingo Puente y Carretera Santa Cruz del Sur; Camagüey Cuba
2. Division of Production; National Center for Animal and Plant Health, Carretera de Jamaica y Autopista Nacional; San José de las Lajas. Mayabeque Cuba
3. Pediatric Intensive Care Department; Gregorio Marañon University General Hospital, c/Puente cesures 1.B 1ºB; 28029 Madrid Spain