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Kirk KM, Doege KJ, Hecht J, Bellamy N, Martin NG.Kirk KM, et al.Twin Res. 2003 Feb;6(1):62-6. doi: 10.1375/136905203762687915.Twin Res. 2003.PMID: 12626230
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Kirk KM, Bellamy N, O'Gorman LE, Kuhnert PM, Klestov A, Muirden K, Tesar P, Walker D, Martin NG.Kirk KM, et al.Twin Res. 2002 Apr;5(2):98-106. doi: 10.1375/1369052022965.Twin Res. 2002.PMID: 11931687