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24. Twin studies and the heritability of MS: a conclusion. Hawkes CH; Macgregor AJ Mult Scler; 2009 Jun; 15(6):661-7. PubMed ID: 19482860 [TBL] [Abstract][Full Text] [Related]
26. Graphical models for causation, and the identification problem. Freedman DA Eval Rev; 2004 Aug; 28(4):267-93. PubMed ID: 15245621 [TBL] [Abstract][Full Text] [Related]
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