Estimates of familial risks from family data are biased when ascertainment of families is not independent of family history.
Environmental, Genetic and Analytic Epidemiology, The University of Melbourne, Parkville, Victoria, Australia.Gut (impact factor: 10.11). 10/2010; 60(8):1162-3; author reply 1163. DOI:10.1136/gut.2010.223826 pp.1162-3; author reply 1163
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