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1) Stiell IG, Wells GA, Vandemheen K, et al. The Canadian CT Head Rule for patients with minor head injury. Lancet. 2001;357(9266):1391-1396.

2) Vilaas S. Shetty, MD; Martin N. Reis, MD; Joseph M. Aulino, MD, et al. ACR Appropriateness Criteria^® Head Trauma. Available at https://acsearch.acr.org/docs/69481/Narrative/ American College of Radiology. Accessed, June 30, 2017.

3) Michael B. Salmela, MD; Shabnam Mortazavi, MD; Bharathi D. Jagadeesan, MD, ACR, et al. Appropriateness Criteria^® Cerebrovascular Disease. https://acsearch.acr.org/docs/69478/Narrative/ American College of Radiology. Accessed, June 30, 2017.

4) Annette C. Douglas, MD; Franz J. Wippold II, MD; Daniel F. Broderick, MD, et al. Appropriateness Criteria^® Headache. https://acsearch.acr.org/docs/69482/Narrative/ American College of Radiology. Accessed, June 30, 2017.

5) Nandini D. Patel, MD; Daniel F. Broderick, MD; Judah Burns, MD, et al. Appropriateness Criteria^® Low Back Pain. https://acsearch.acr.org/docs/69483/Narrative/ American College of Radiology. Accessed, June 30, 2017.

6) Richard H. Daffner, MD; Barbara N. Weissman, MD; Franz J. Wippold II, MD, et al. Appropriateness Criteria^® Suspected Spine Trauma. https://acsearch.acr.org/docs/69359/Narrative/ American College of Radiology. Accessed, June 30, 2017.