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Impact of misclassification of in vitro fertilisation in studies of folic acid and twinning: modelling using population based Swedish vital records

BMJ 2005; doi: https://doi.org/10.1136/bmj.38369.437789.82 (Published 18 February 2005) Cite this as: BMJ 2005;:bmj;bmj.38369.437789.82v1

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