XerostomiaSalivationSalivary GlandsXerophthalmiaBurning Mouth SyndromeSjogren's SyndromeRadiation InjuriesParotid GlandHead and Neck NeoplasmsRadiotherapy, Intensity-ModulatedSubmandibular Gland DiseasesPilocarpineTaste DisordersSialadenitisSaliva, ArtificialOrgan Sparing TreatmentsSalivary Gland DiseasesRadiotherapyNasopharyngeal NeoplasmsMouth DiseasesAmifostineSecretory RateSubmandibular GlandRadiotherapy, ConformalAcupuncture TherapyRadiation-Protective AgentsMucin-5BSalivary Glands, MinorKeratoconjunctivitis SiccaThirstMouth MucosaAquaporin 5Chewing GumStomatitisQuinuclidinesRadiotherapy DosageOropharyngeal NeoplasmsMaxillary DiseasesTooth Diseases