Department of Obstetrics and Gynecology;
State University Hospital of Skopje;
Skopje;
Republic of Macedonia;
Department of Obstetrics and Gynecology;
Vivantes Klinikum im Friedrichshain;
Berlin;
Germany;
Division of Obstetrics and Maternal-Fetal Medicine;
Medical University Vienna;
Vienna;
Austria;
Department of Orthopedics;
State University Hospital of Skopje;
Skopje;
Republic of Macedonia;
Preterm; Labour/Labor; Preterm; Birth; phIGFBP-1; Parto; Sure; PAMG-1;