[1] McMaster Univ, Sch Nursing, Hamilton, ON L8S 4L8, Canada
[2] McMaster Univ, Dept Family Med, Hamilton, ON L8S 4L8, Canada
[3] Univ Regina, Fac Nursing, Regina, SK S4S 0A2, Canada
[4] McMaster Univ, Dept Clin Epidemiol & Biostat, Hamilton, ON L8S 4L8, Canada
[5] Queens Univ Belfast, Sch Midwifery, Belfast BT7 1NN, Antrim, North Ireland
[6] Ryerson Univ, Daphne Cockwell Sch Nursing, Toronto, ON, Canada
[7] Dalhousie Univ, Sch Nursing, Halifax, NS B3H 3J5, Canada
[8] Univ Regina, Dept Psychol, Regina, SK S4S 0A2, Canada
[9] Dept Family Med, Hamilton, ON, Canada