[1] Mt Royal Univ, Sch Nursing & Midwifery, 4825 Mt Royal Gate SW, Calgary, AB T3E 6K6, Canada
[2] Univ Calgary, OBrien Inst Publ Hlth, Calgary, AB, Canada
[3] Univ Calgary, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada
[4] Univ Calgary, Fac Nursing, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada
[5] Alberta Childrens Prov Gen Hosp, Res Inst, Calgary, AB, Canada
[6] Alberta Hlth Serv, Foothills Med Ctr, Dept Paediat, Sect Neonatol, 1403 29th St NW, Calgary, AB T2N 2T9, Canada
[7] Alberta Hlth Serv, Prenatal & Postpartum Serv, Publ Hlth Calgary Zone, 1430,10101 Southport Rd SW, Calgary, AB T2W 3N2, Canada