K. N. Rattan, P. -, O. Baridabad, K. K. Yadav, and B. Chopra, “Hairpin impacted in the duodenum of a 4-month-old child - a rarity”, Indian J Child Health, vol. 4, no. 4, pp. 647–648, Dec. 2017, doi: 10.32677/IJCH.2017.v04.i04.046.