Optimising neonatal services for very preterm births between 27+0 and 31+6 weeks gestation in England: the OPTI-PREM mixed-methods study by Thillagavathie Pillay, Oliver Rivero-Arias, Natalie Armstrong, Sarah E Seaton, Miaoqing Yang, Victor L Banda, Kelvin Dawson, Abdul QT Ismail, Vasiliki Bountziouka, Caroline Cupit, Alexis Paton, Bradley N Manktelow, Elizabeth S Draper, Neena Modi, Helen E Campbell, Elaine M Boyle

“…We used an instrumental variable approach to control for unmeasured differences between units. The instrument selected was maternal excess travel time between NICU and LNU. …”
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