Nevitt, M.C., Ettinger, B., Black, D.M., Stone, K., Jamal, S.A., Ensrud, K., Segal, M., Genant, H.K. and Cummings, S.R. (1998) The association of radiographically detected vertebral fractures with back pain and function: A prospective study. Annals of Internal Medicine, 128, 793-800.