1. NICE clinical guideline 124. Hip fracture: the management of hip fracture in adults;NICE,2011
2. National hip fracture database national report,2012
3. New classification of physical status;Dripps;Anesthesiology,1963
4. Outcome following proximal femoral fracture in Northern Ireland;Beringer;Ulster Med J,2006
5. Outcome following hip fracture: post-discharge residence and long term mortality;Johansen;Age Aging,2010