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. Author manuscript; available in PMC: 2019 Oct 1.
Published in final edited form as: Best Pract Res Clin Obstet Gynaecol. 2018 Apr 11;52:88–102. doi: 10.1016/j.bpobgyn.2018.03.007

FIGURE 1:

FIGURE 1:

Diagram showing the complexity of sPTB. This figures lists various factors that can “trigger” or “activate” each compartment (uterus, cervix, fetus/placenta, amniotic sac) which can ultimately lead to sPTB