Clinical clearance of the cervical spine in blunt trauma patients younger than 3 years: a multi-center study of the american association for the surgery of trauma. - Pieretti-Vanmarcke R; Velmahos GC; Nance ML; Islam S; Falcone RA Jr; Wales PW; Brown RL; Gaines BA; McKenna C; Moore FO; Goslar PW; Inaba K; et al. (The Journal of trauma, 2009)