1. Born Too Soon: Preterm birth matters
2. Brazilian Ministry of Health.DATASUS/SINASC. [Live birth registry].http://www2.datasus.gov.br/DATASUS/index.php?area=060702. Accessed December 20 2018.
3. Leading causes of child mortality in Brazil, in 1990 and 2015: Estimates from the Global Burden of Disease study;França EB;Rev Bras Epidemiol,2017
4. Cervical pessary for preventing preterm birth;Abdel‐Aleem H;Cochrane Database Syst Rev,2013
5. Prenatal administration of progesterone for preventing preterm birth in women considered to be at risk of preterm birth;Dodd JM;Cochrane Database Syst Rev,2013