[1] Univ Montreal, Dept Obstet & Gynecol, Fac Med, Montreal, PQ H3T 1C5, Canada
[2] Univ Montreal, Ste Justine Hosp Res Ctr, Montreal, PQ, Canada
[3] Yale Univ, Yale Sch Nursing, Grad Nursing Programs, New Haven, CT USA
[4] Univ Laval, Fac Med, Dept Obstet & Gynaecol, Quebec City, PQ G1K 7P4, Canada