Szczeklik, K., D. Owczarek, M. Żarow, J. Pytko-Polończyk, and T. Mach. “Prevalence of Dental Caries and Oral Hygiene Habits in Patients With Crohn’s Disease Living in Urban and Rural Regions of Southern Poland”. Medicina Internacia Revuo - International Medicine Review, Vol. 27, no. 109, Dec. 2017, pp. 280-7, https://interrev.com/mir/index.php/mir/article/view/122.