1 Sussex Eye Hospital, University Hospitals Sussex NHS Foundation Trust, Eastern Road, Brighton, BN2 5BF, UK. tomwoodresearch@gmail.com.
2 Sussex Eye Hospital, University Hospitals Sussex NHS Foundation Trust, Eastern Road, Brighton, BN2 5BF, UK.
3 Heathrow Airport, London, TW6, UK.
4 Resuscitation Services Department, Southpoint Building, Royal Sussex County Hospital, University Hospitals Sussex NHS Foundation Trust, Brighton, BN2 1HA, UK.
5 Tennent Institute of Ophthalmology, Gartnavel General Hospital, Glasgow, G12 0YN, UK.
6 Brighton and Sussex Medical School, Falmer, Brighton, BN1 9PX, UK.