Department of Obstetrics and Gynecology;
Jessenius Faculty of Medicine;
Comenius University in Bratislava;
Martin;
Slovakia;
Hemathology and Transfusiology Clinics;
Jessenius Faculty of Medicine;
Comenius University in Bratislava;
Martin;
Slovakia;
Maternal Smoking; Pregnancy; Erythropoetin; Carboxyhemoglobin; Umbilical Cord;