[1]
R. Madhok, L. J. Melton, E. J. Atkinson, W. M. O’Fallon, and D. G. Lewallen, “Urban vs rural increase in hip fracture incidence: Age and sex of 901 cases 1980-89 in Olmsted County, U.S.A”., ActaO, vol. 64, no. 5, pp. 543–548, Jan. 1993.