1. Thames Valley University, Royal Brompton Hospital, Britten Street Wing, London SW3-6NP, UK
2. Royal Brompton and Harefield NHS Trust, Sydney Street, London SW3-6NP, UK
3. Honorary Clinical Teaching Fellow, Imperial College, London, UK
4. Department of Education, Royal Brompton and Harefield NHSTrust, Britten Street Wing, London SW3-6NP, UK
5. Buckinghamshire and Chilterns University College, Chalfont campus, Gorelands lane, Chalfont St Giles, Bucks HP8 4AD, UK