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FilenameFormatSizeDescription
opo12042-sup-0001-AppendixS1.TIFimage/tif420KAppendix S1. TwinsUK questionnaire conducted between 2002 and 2003.
opo12042-sup-0002-AppendixS2.docxWord document37KAppendix S2. ‘HATS’ questionnaire conducted between 2007 and 2010.

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