Suliga, K., T. Grzelak, J. Grupińska, M. Pelczyńska, M. Sperling, and K. Czyżewska. “Evaluation of Using Dietary Supplements Among Polish Adult People below and over 60 Years of Age”. Journal of Medical Science, vol. 86, no. 3, Sept. 2017, pp. 213-9, doi:10.20883/jms.2017.194.