beta CaroteneCarotenoidsVitamin AVitamin EOral Submucous FibrosisVitaminsAntioxidantsAscorbic AcidDietary Supplementsalpha-TocopherolDouble-Blind MethodPhycomycesVitamin A Deficiencybeta-Carotene 15,15'-MonooxygenaseRetinol-Binding ProteinsRetinol O-Fatty-Acyltransferasezeta CaroteneSmokingGeranylgeranyl-Diphosphate GeranylgeranyltransferaseRetinol-Binding Proteins, PlasmaCataractRiskXanthophyllsIncidenceTreatment FailureRetinol-Binding Proteins, CellularLuteinInterleukin-1betaFollow-Up StudiesCardiovascular DiseasesIntramolecular LyasesProportional Hazards Modelsbeta 2-MicroglobulinLung NeoplasmsNorisoprenoidsRetinoidsDaucus carotaDietChromatography, High Pressure LiquidTretinoinPlants, EdibleReceptors, Adrenergic, betaIntegrin beta3FruitMicronutrientsRetinaldehydeMucoralesErwinia