The Canadian C-spine rule for radiography in alert and stable trauma patients. - Stiell,I.G.; Well,G.A.; Vandemheen,K.L.; Clement,C.M.; Lesiuk,H.; de Maio,V.J.; Laupacis,A.; Schull,M.; McKnight,R.D.; Verbeek,R.; Brison,R.; Cass,D.; et al. (JAMA, 2001)