Halimi Asl, A.A., Safari, S. and Parvareshi Hamrah, M. 2017. Epidemiology and Related Risk Factors of Preterm Labor as an Obstetrics Emergency. Archives of Academic Emergency Medicine. 5, 1 (Jan. 2017), e3. DOI:https://doi.org/10.22037/aaem.v5i1.106.