[1] Dalhousie Univ, Dept Family Med, Halifax, NS B3H 2E2, Canada
[2] St Marys Univ, Halifax, NS, Canada
[3] Dalhousie Univ, Dept Epidemiol & Community Hlth, Halifax, NS, Canada
[4] Dalhousie Univ, Sch Hlth & Human Performance, Halifax, NS, Canada
[5] Dalhousie Univ, Dept Med, Halifax, NS, Canada
[6] Queen Elizabeth II Hlth Sci Ctr, Halifax, NS, Canada