Aynacı, F. Müjgan, et al. “Frequency of Cardiovascular and Gastrointestinal Malformations, Leukemia and Hypothyroidism in Children With Down Syndrome in Trabzon, Turkey”. The Turkish Journal of Pediatrics, vol. 40, no. 1, Jan. 1998, pp. 103-9, https://doi.org/10.24953/turkjpediatr.1998.3287.