Sowa, K., Glista, J., Pop, T., Gdańska, N., Adamczyk, M., & Adamek, J. (2012). Influence of social and demographic factors on clinical status and severity of chronic fatigue syndrome in patients with multiple sclerosis. Polish Journal of Public Health, 122(3), 256-260. https://doi.org/10.12923/j.0044-2011/122/3/a.06