1. Department of Anaesthesia, Critical Care and Pain Medicine University of Edinburgh UK
2. Usher Institute University of Edinburgh UK
3. Department of Anaesthesia, Critical Care and Pain Medicine Royal Infirmary of Edinburgh UK
4. MRC Centre for Reproductive Health Queen's Medical Research Institute, University of Edinburgh UK
5. Department of Anaesthesia, Critical Care and Pain Medicine Ninewells Hospital Dundee UK
6. University of Edinburgh UK
7. Department of Anaesthesia, Critical Care and Pain Medicine Glasgow Royal Infirmary Glasgow UK
8. Public Health Scotland Glasgow UK