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what were nicol and gottsman's findings from their family studies of SZ?

what are the methodological problems with twin studies?

what is pairwise concordance?

what is probandwise concordance?

what is the Weinberg method?

what was Joseph's twin study data in 2003?

what would be the result if only 9 of the most recent carefully planned out studies were included in Joseph's data?

what is the logic behind adoption studies?

what was Hestons adoption study?

what was kety et al's study?