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机构:
Nordic Sch Publ Hlth, Gothenburg, Sweden
Natl Board Hlth & Welf, Stockholm, Sweden
Stockholm Univ, Karolinska Inst, Ctr Hlth Equ Studies CHESS, S-10691 Stockholm, Sweden Karolinska Inst, Dept Womens & Childrens Hlth, Div Reprod & Perinatal Hlth, Stockholm, Sweden