Petritsa, N. A., et al. “Effect of Undifferentiated Connective Tissue Dysplasia on the Development of Vesicoureteral Reflux in Infants”. Journal of Education, Health and Sport, vol. 7, no. 10, Oct. 2017, pp. 186-97, https://apcz.umk.pl/JEHS/article/view/5110.