[1
]Policy Research Unit in Maternal Health and Care National Perinatal Epidemiology Unit,
Nuffield Department of Population Health, University of Oxford Oxford United Kingdom
[2
]Department of Health Sciences University of Leicester Leicester UK
[3
]Institute of Applied Health Research University of Birmingham Birmingham UK
[4
]Sands, stillbirth and neonatal death charity London UK
[5
]Royal College of Midwives London UK
[6
]Bradford Royal Infirmary Bradford UK