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Ryg, Jesper1,2; Rejnmark, Lars3; Overgaard, Soren2,4; Brixen, Kim1,2; Vestergaard, Peter3
Hip fracture patients at risk of second hip fracture:​ a nationwide population-based cohort study of 169,145 cases during 1977–2001
J Bone Miner Res. July 2009;​24(7):​1299-1307