1. Health Economics and Health Technology Assessment, School of Health and Wellbeing, University of Glasgow, Glasgow, UK
2. Wolfson Medical School Building, School of Medicine, Dentistry and Nursing, University of Glasgow, Glasgow, UK
3. Aberdeen Maternity Hospital, National Health Service Grampian, Aberdeen, UK
4. Glasgow Royal Infirmary, School of Medicine, Dentistry and Nursing, University of Glasgow, Glasgow, UK
5. NIHR Biomedical Research Centre, University of Bristol, Bristol, UK
6. TFP Oxford Fertility, Institute of Reproductive Sciences, Oxford, UK