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Title
Increasing twinning rates in Norway, 1967-2004: the influence of maternal age and assisted reproductive technology (ART).
Authors
Tandberg, Anne; Bjørge, Tone; Børdahl, Per E; Skjaerven, Rolv
Abstract
The incidence of twin pregnancies is increasing in industrialized countries, including Norway. In the present nationwide study from Norway, we aimed at evaluating the effect of assisted reproductive technologies and delayed childbearing age on this epidemic rise.