Effect of in-hospital comprehensive geriatric assessment (CGA) in older people with hip fracture. The protocol of the Trondheim Hip Fracture Trial oleh Taraldsen Kristin, Thingstad Pernille, Helbostad Jorunn L, Sletvold Olav, Prestmo Anders, Lamb Sarah E, Aamodt Arild, Johnsen Roar, Magnussen Jon, Saltvedt Ingvild