[1] Univ Manchester, Sch Hlth Sci, Div Nursing Midwifery & Social Work, Fac Biol Med & Hlth, Jean McFarlane Bldg Room 4-336,Oxford Rd, Manchester M13 9PL, Lancs, England
[2] Univ Manchester, Fac Biol Med & Hlth, Sch Hlth Sci, Div Nursing Midwifery & Social Work, Manchester, Lancs, England
[3] Univ Leeds, Fac Med & Hlth, Sch Healthcare, Baines Wing, Leeds LS2 9JT, W Yorkshire, England
[4] Univ York, Fac Sci, Dept Hlth Sci, Seebohm Rowntree Bldg, York YO10 5DD, N Yorkshire, England