Adenoma, VillousAdenomaBarrett EsophagusEsophagoscopyPrecancerous ConditionsEsophageal NeoplasmsEsophagectomyAdenocarcinomaEsophagusColonic PolypsColorectal NeoplasmsColitis, UlcerativeBiopsyDuodenal NeoplasmsAmpulla of VaterColonoscopyCommon Bile Duct NeoplasmsIntestinal PolypsMuscle NeoplasmsNeoplasms, Multiple PrimaryAppendiceal NeoplasmsSingle-Blind MethodRectal NeoplasmsMetaplasiaPolypsColonic NeoplasmsFibrous Dysplasia of Bone