Uluşahin, N, et al. “Effects of Oral and Intramuscular Vitamin K Prophylaxis on PIVKA-II Assay Parameters in Breastfed Infants in Turkey”. The Turkish Journal of Pediatrics, vol. 38, no. 3, July 1996, pp. 295-00, https://turkjpediatr.org/article/view/3493.