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[Comment] Progestogens and preterm birth—not the hoped for panacea?

Preterm birth is the most common cause of neonatal morbidity and mortality globally, affecting about 15 million children every year.1 Of children born preterm, an estimated 2·4 million (15·6%) are born extremely preterm (before 28 weeks gestation) or very preterm (before 32 weeks gestation).1 Furthermore, some 1 million children every year die as a consequence of preterm birth or its complications.1 In 2014, the Preterm Birth Priority Setting Partnership in the UK identified prediction and prevention of preterm birth as the top research priority in this area.