[1] UCL, Primary Care Populat Hlth Dept, London, England
[2] Newcastle Univ, Sch Med Educ, Newcastle Upon Tyne, England
[3] Queen Mary Univ London, London, England
[4] Univ Glasgow, Sch Med Dent & Nursing, Glasgow, Scotland
[5] Publ Contributor, London, England
[6] Queen Mary Univ London QMUL, Inst Hlth Sci Educ, London, England