Measurement of the Maternal Serum 25 - Hydroxyvitamin D, Neutrophil - to - Lymphocyte Ratio and Paraoxonase 1 Levels in the Prediction of Spontaneous Preterm Birth. Journal of Pharmaceutical Negative Results [Internet]. 2022 Sep. 22 [cited 2026 Jun. 5];:651-6. Available from: https://pnrjournal.com/index.php/home/article/view/651