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. 2008 Mar 4;98(8):1475–1481. doi: 10.1038/sj.bjc.6604250

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Copyright © 2008 Cancer Research UK

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Proportion of twins by zygosity who live with their twin (left) and meet with their twin everyday (right), by survey wave. DZO, opposite-sex dizygotic or fraternal twins; DZS, same-sex dizygotic or fraternal twins; MZ, monozygotic or identical twins.