School of Nursing & Midwifery University of Newcastle, Port Macquarie Campus, PO Box 210, Port Macquarie, 2444, NSW, Australia. shanna.fealy@newcastle.edu.au. Faculty of Health & Medicine School of Medicine & Public Health, University of Newcastle, Callaghan, NSW, Australia. shanna.fealy@newcastle.edu.au. Maternity Care Services, The Port Macquarie Base Hospital, Port Macquarie, NSW, Australia. shanna.fealy@newcastle.edu.au. Faculty of Health & Medicine School of Medicine & Public Health, University of Newcastle, Callaghan, NSW, Australia. Mothers and Babies Research Centre, University of Newcastle, University Drive, Callaghan, 2308, NSW, Australia. Hunter Medical Research Institute, Newcastle, NSW, Australia. School of Nursing & Midwifery University of Newcastle, Port Macquarie Campus, PO Box 210, Port Macquarie, 2444, NSW, Australia. Centre for Midwifery, Child and Family Health, Faculty of Health, University of Technology Sydney, PO Box 123, Broadway, Ultimo, NSW, 2007, Australia. Centre for Clinical Epidemiology and Biostatistics, School of Medicine & Public Health, University of Newcastle, Callaghan, NSW, Australia. Division of Medicine, John Hunter Hospital, Newcastle, NSW, Australia.