Answers are grounded in this paper and cite their sources.
"Preterm Birth: Causes, Consequences and Prevention." Journal of Obstetrics and Gynaecology, 28(5), p. 559
No takes yet. Share an insight, caveat, or question.
James P. Boardman (2008) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: