1. Aaron, J.E., Gallagher, J.C., Anderson J., Stasiak, L., Longton, E.B., Nordin, B.E.C., and Nicholson M., 1974, Frequency of osteomalacia and osteoporosis in fractures of the proximal femur, Lancet 1: 229.
2. Boland, R., 1986, Role of vitamin D in skeletal muscle function, Endocrinol. Rev. 7: 434.
3. Bouillon, R.A., Auwerx, J.H., Lissens, W.D., and Pelemans, W.K., 1987, Vitamin D status in the elderly; seasonal substrate deficiency causes 1,25-dihydroxycholecalciferol deficiency, Am. J. Clin. Nutr. 45: 755.
4. Bouillon, R., Pelemans, W., and Quesada, J.M., 1991, “Vitamin D deficiency in the elderly,” in: Nutritional Aspects of Osteoporosis (P. I3uckhardt and R.P. Heaney, eds.), Serono Symposia 85, pp. 245–256, Raven Press, New York.
5. Brown, I.R.E, Bakowska, A., and Millard, PH., 1976, Vitamin D status of patients with femoral neck fracture, Age Aging 5: 127.