I. Stiell, G. Wells, A. Laupacis, R. Brison, R. Verbeek, K. Vandemheen, C D. Naylor,
Multicentre trial to introduce the Ottawa ankle rules for use of radiography in acute ankle injuries. Multicentre Ankle Rule Study Group. BMJ. ,vol. 311, pp. 594- 597 ,(1995) ,
10.1136/BMJ.311.7005.594