Potential for bias in studies on efficacy of prophylactic surgery for BRCA1 and BRCA2 mutation.

Bias Breast Neoplasms/diagnosis,epidemiology,genetics,surgery Confounding Factors, Epidemiologic Decision Making Female Genes, BRCA1 Genes, BRCA2 Germ-Line Mutation Humans Mastectomy Ovariectomy Risk Assessment Risk Factors Survival Rate