1. Preterm birth time trends in Europe, a study of 19 countries;J Zeitling;Br J Obstet Gynaecol,2013
2. The global epidemiology of preterm birth;I P Vogel;Best Pract Res Clin Obstet Gynaecol,2018
3. Preterm labor: one syndrome, many causes;R Romero;Science,2014
4. Efficacy of progesterone for prevention of preterm birth;L Syhes;Best Pract Res Clin Obstet Gynecol,2018
5. Progesterone for prevention of preterm birth – evidence-based indications;J R Kuon;Z Gebh Neonatal,2015