Kramer, M. S.
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McGill Univ, Fac Med, Dept Epidemiol, Montreal, PQ H3G 1Y6, Canada
McGill Univ, Fac Med, Dept Biostat, Montreal, PQ H3G 1Y6, Canada
McGill Univ, Fac Med, Dept Occupat Hlth, Montreal, PQ H3G 1Y6, Canada
McGill Univ, Fac Med, Dept Pediat, Montreal, PQ H3G 1Y6, Canada
Natl Univ Singapore, Natl Univ Hosp, Dept Obstet & Gynaecol, Singapore 119228, Singapore Uppsala Univ, Dept Womens & Childrens Hlth, S-75185 Uppsala, Sweden