A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL. The file type is application/pdf.
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Syuichi Ooki, Yuji Okazaki, Akio Asaka. "Characteristics of a Japanese Adult Twin Database of High School Graduates." Twin research 7.5 (2004) 430-434