[1] Univ Sorbonne Paris Cite, Hop Univ Necker Enfants Malades, AP HP, Dept Pediat Orthoped, F-75743 Paris 15, France
[2] Univ Paris 05, Sorbonne Paris Cite, INSERM, UMR S Pharmacol Toxicol & Signalisat Cellulaire 7, Paris, France
[3] Univ Sorbonne Paris Cite, Hop Univ Necker Enfants Malades, AP HP, Serv Neurochirurg Pediat, F-75743 Paris 15, France