By Zondervan Hans A   van Gemert Martin JC   Nikkels Peter JG   Omtzigt Annemieke   Offringa Martin   Deprest Jan   Bleker Otto P   in Twin Research

ISSN:1369-0523|2|4|286-289

Australian Academic Press‎(1999)‎

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By Roseboom Tessa J.   van der Meulen Jan H.P.   Ravelli Anita C.J.   Osmond Clive   Barker David J.P.   Bleker Otto P.   in Twin Research

ISSN:1369-0523|4|5|293-298

Australian Academic Press‎(2001)‎

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