Celik, T. H., Korkmaz, A., Yigit, S. and Yurdakok, M. (2019) “Cord Blood Theophylline Levels and Respiratory Morbidities In Preterm Infants”, Gynecology Obstetrics & Reproductive Medicine. Ankara, TR, 25(2), pp. 112–116. doi: 10.21613/GORM.2018.856.