Centre for Maternal and Child Health Research, School of Health Sciences City, University of London, London, UK. susan.ayers@city.ac.uk

Reader (Associate Professor) in Health Research, Department of Nursing and Midwifery, University of Huddersfield, UK z.darwin@hud.ac.uk

School of Human and Social Sciences, University of West London, London, UK. caroline.lafarge@uwl.ac.uk

School of Psychology, University of Liverpool, Liverpool, UK v.fallon@liverpool.ac.uk

Department of Brain and Behavioural Sciences, University of Pavia, Pavia, Italy. nicola.carone@unipv.it