Kahraman, A. B., Yıldız, Y., Geçici, N. N., Çıkı, K., Erdal, İ., Akar, H. T., Dursun, A., Tokatli, A., & Sivri, S. (2025). Impact of the COVID-19 Era on Phenylalanine Levels and Classical Phenylketonuria Patients Follow-Up: A Retrospective Analysis. Turkish Journal of Pediatric Disease, 19(2), 59-63. https://doi.org/10.12956/tchd.1537456