K. S. Sarkis, M. B. Salvador, M. M. Pinheiro, R. G. Silva, C. A. Zerbini, and L. A. Martini, “Association between osteoporosis and rheumatoid arthritis in women: a cross-sectional study”, Sao Paulo Med J, vol. 127, no. 4, pp. 216–222, Jul. 2009.