[1] Univ Stirling, Fac Hlth Sci & Sport, Stirling, Scotland
[2] Dept Psychol Med, NHS Lothian, Edinburgh, Scotland
[3] EMERGE Res Grp, NHS Lothian, Edinburgh, Scotland
[4] Royal Infirm Edinburgh NHS Trust, Emergency Dept, NHS Lothian, Edinburgh, Scotland
[5] Univ Edinburgh, Sch Hlth Social Sci, Edinburgh, Scotland
[6] Med Educ Directorate, NHS Lothian, Edinburgh, Scotland