1. Necker Hospital for Sick Children; Inserm U1153; Paris-Descartes University; Paris France
2. King's College London; London United Kingdom
3. Association Clinique et Thérapeutique Infantile du Val-de-Marne; Saint-Maur-des-Fossés; Association Française de Pédiatrie Ambulatoire; Chambéry France
4. Department of Health Science; University Hospital Anna Meyer; Florence Italy