[1] Univ Manchester, Inst Populat Hlth, Ctr Primary Care, NIHR Sch Primary Care Res,MAHSC, Manchester M13 9PL, Lancs, England
[2] Univ Manchester, Inst Populat Hlth, NIHR Collaborat Appl Hlth Res & Care, Greater Manchester GM CLAHRC,MAHSC, Manchester M13 9PL, Lancs, England
[3] Univ Manchester, Inst Populat Hlth, Sch Nursing Midwifery & Social Work, Manchester M13 9PL, Lancs, England
[4] Univ Manchester, Inst Populat Hlth, NIHR Greater Manchester Primary Care Patient Safe, Ctr Primary Care,MAHSC, Manchester M13 9PL, Lancs, England