[1] Inst Veille Sanit, F-94415 St Maurice, France
[2] Ctr Hosp Intercommunal, Serv Pediat, F-94010 Creteil, France
[3] Univ Paris 05, Hop Necker Enfants Malad, AP HP, Serv Pneumol & Allergol Pediat, F-75743 Paris 15, France
[4] CHU Timone Enfants, Unite Med Infantile, F-13385 Marseille, France
[5] Hop Jeanne de Flandre, Pediat Clin, Unite Pneumol Allergol, F-59037 Lille, France
[6] Hop Charles Nicolle, Dept Pediat Med, Unite Pneumol & Allergol Pediat, F-76031 Rouen, France