The Canadian C-spine rule.
Hall
Ferris M
FM
D002574:Cervical Vertebrae / Q000000981:diagnostic imaging / Q000293:injuries*; D003661:Decision Support Techniques; D017048:Health Care Costs; D006801:Humans; D019838:Neck Injuries / Q000000981:diagnostic imaging* / Q000191:economics; D011859:Radiography; D014194:Traumatology / Q000191:economics / Q000592:standards