Screening of eligible patients: The attending Pediatric Intensivist and a Research Nurse will check for candidates on a daily basis in the pediatric intensive care unit (PICU) of Sainte-Justine Hospital (HSJ). An eligibility screening log, documenting the subject's fulfillment of the entry criteria, will be completed for all eligible patients considered for the study, regardless of their subsequent inclusion or exclusion status ("Bookkeeping"). Consent will be solicited from parents or legal guardians if a patient fulfils eligibility criteria and presents no exclusion criteria.