Acknowledgement
Firstly, we would like to thank the women who participated in the study, and the midwives and doctors who informed women about the study, recruited the women and provided care. We also thank the START Data Safety Monitoring Committee, Diogo Ayres-de-Campos, Scott Morris and Katherine Lee. We also thank Dr Edwin Chandraharan, who provided training in STan monitoring and designed and initiated the implementation of our STAN staff training and accreditation programme.