[1] Edith Cowan Univ, Fac Hlth & Human Sci, Churchlands, WA 6018, Australia
[2] Univ Saskatchewan, Dept Epidemiol & Community Hlth, Saskatoon, SK S7N 0W0, Canada
[3] Univ Alberta, Fac Nursing, Edmonton, AB T6G 2M7, Canada
[4] Univ Alberta, Dept Math Sci, Edmonton, AB T6G 2M7, Canada
[5] Univ Manitoba, Fac Nursing, Winnipeg, MB R3T 2N2, Canada