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1) Royal College of Physicians and Surgeons of Canada, CanMEDS Framework. http://www.royalcollege.ca/rcsite/canmeds/canmeds-framework-e Last accessed July 31, 2017.

2) American College of Radiology, Appropriateness Criteria.  https://www.acr.org/Quality-Safety/Appropriateness-Criteria Last accessed July 31, 2017.

3) Canadian Association of Radiologists, Referral Guidelines. http://www.car.ca/en/standards-guidelines/guidelines.aspx Last accessed July 31, 2017.

4) Choose Wisely Canada, Radiology.  https://choosingwiselycanada.org/radiology/ Last accessed July 31, 2017.