Affiliation: | 1. Service de pédiatrie, pavillon de pédiatrie médico-chirurgicale, centre hospitalier de Roubaix, 11-17, boulevard Lacordaire, BP 359, 59056 Roubaix, France;2. Service de radiologie, centre hospitalier de Roubaix, 11-17, boulevard Lacordaire, BP 359, 59056 Roubaix, France;1. Department of Emergency Medicine, Brigham and Women''s Hospital, Boston, Massachusetts;2. Department of Emergency Medicine, Massachusetts General Hospital, Boston, Massachusetts;3. Department of Emergency Medicine, Harvard Medical School, Boston, Massachusetts;4. Department of Emergency Medicine, Mount Auburn Hospital, Cambridge, Massachusetts |