Ethical considerations. Parents or legal representatives of the child will be informed about the study, requesting their signature for consent. Human research guidelines will be respected according to "good clinical practice". The protocol will be submitted to the Bioethics Committee of the New Civil Hospital of Guadalajara and the University of Guadalajara. Care will be taken to respect the recommendations of the Helsinki Declaration in its last correction made during the 64th Annual Assembly organized by the World Medical Association (2013).