[1] Lille Univ Hosp, Pediat, Lille, France
[2] Lille Univ Hosp, Epidemiol, Lille, France
[3] Rouen Univ Hosp, Gastroenterol, Rouen, France
[4] Amiens Univ Hosp, Gastroenterol, Amiens, France
[5] Lille Univ Hosp, Publ Hlth, Lille, France
[6] Lille Catholic Univ Hosp, Pediat, Lille, France
[7] Rouen Univ Hosp, Pediat, Rouen, France
[8] Amiens Univ Hosp, Pediat, Amiens, France
[9] Lille Univ Hosp, Gastroenterol, Lille, France
[10] Nancy Univ Hosp, Gastroenterol, Nancy, France
[11] Lille Univ Hosp, Biostat, Lille, France