[1] Ctr Hosp Reg Univ Lille, Hop Jeanne de Flandre, Dept Chirurg & Orthopedie Enfant, F-59037 Lille, France
[2] Ctr Hosp Reg Univ Lille, Hop Huriez, F-59037 Lille, France
[3] Ctr Hosp Reg Univ Rouen, Clin Chirurg Infantile, Rouen, France
[4] Ctr Hosp Reg Univ Caen, Serv Chirurg Infantile, Caen, France
[5] Ctr Hosp Reg Univ Amiens, Serv Chirurg Infantile, Amiens, France