Kołodziej, K., Kwolek, A., Rusek, W., Przysada, G. and Szpunar, P. (2005) “Correlation between lower extremities symmetrical index and intensification of lower back pain in patients after hospital rehabilitation”, European Journal of Clinical and Experimental Medicine, 3(3), pp. 234–236. Available at: https://journals.ur.edu.pl/ejcem/article/view/13448 (Accessed: 6 August 2026).