1 Inserm U1153, Center for Epidemiology and Statistics Sorbonne Paris Cité; Hôpital Necker-Enfants Malades; Paris Descartes University, Paris; and Institut Gustave Roussy, Villejuif; Université Paris Sud, Le Kremlin Bicêtre, France jean-francois.brasme@inserm.fr.
2 Inserm U1153, Center for Epidemiology and Statistics Sorbonne Paris Cité; Hôpital Necker-Enfants Malades; Paris Descartes University, Paris, France.
3 Institut Gustave Roussy, Villejuif; Université Paris Sud, Le Kremlin Bicêtre, France.