Polak, E., K. Dereń, E. Łuszczki, J. Wyszyńska, A. Piątek, and A. Mazur. “Risk factors for overweight and obesity in pre-school children”. European Journal of Clinical and Experimental Medicine, vol. 16, no. 1, Mar. 2018, pp. 5–13, doi:10.15584/ejcem.2018.1.1.