Suyasa, I. K., and I. G. N. Y. Setiawan. “The Role of Aging, Body Mass Index and Estrogen on Symptomatic Lumbar Osteoarthritis in Post-Menopausal Women”. International Journal of Research in Medical Sciences, vol. 4, no. 5, Dec. 2016, pp. 1325-8, doi:10.18203/2320-6012.ijrms20161003.