Mannius, S., Mellström, D., Oden, A., Rundgren, Åke, & Zetterberg, C. (1987). Incidence of hip fracture in Western Sweden 1974-1982: Comparison of rural and urban populations. Acta Orthopaedica, 58(1), 38–42. https://doi.org/10.3109/17453678709146340