title: Finding families in a six state area.
mesh_terms: D003219:Confidentiality; D006753:Hospital Records; D006801:Humans; D007417:Intestinal Polyps / Q000453:epidemiology* / Q000235:genetics; D008396:Maryland; D012042:Registries; D012106:Research; D011795:Surveys and Questionnaires; D014768:Virginia