[1] Univ Lincoln, Lincoln Int Inst Rural Hlth, Lincoln LN6 7TS, Lincs, England
[2] Univ Lincoln, Coll Social Sci, Sch Hlth & Social Care, Lincoln LN6 7TS, Lincs, England
[3] Univ Waterloo, Sch Pharm, 10 Victoria St SA, Kitchener, ON N2G 1C5, Canada
[4] Umea Univ, Dept Epidemiol & Global Hlth, Umea, Sweden
[5] Univ Waterloo, Sch Publ Hlth Sci, Waterloo, ON, Canada
[6] Univ Lincoln, Community & Hlth Res Unit, Lincoln LN6 7TS, Lincs, England