[1] Royal Coll Surgeons Ireland, Dept Publ Hlth Med & Epidemiol, Dublin 2, Ireland
[2] Univ Coll Cork, Dept Sociol, Cork, Ireland
[3] Royal Coll Surgeons Ireland, Dept Psychol, Dublin 2, Ireland
[4] Beaumont Hosp, Dept Endocrinol, Dublin 9, Ireland
[5] Connolly Hosp, Dept Endocrinol, Dublin, Ireland