Medical FutilityWithholding TreatmentRefusal to TreatDissent and DisputesEthicistsPersistent Vegetative StateSecularismLife Support CareEthics, MedicalPhysiciansPersonal AutonomyEarly Termination of Clinical TrialsEuthanasia, PassiveDecision MakingPhysician's RolePhysicians, Primary CarePhysicians, FamilyPhysician's Practice PatternsEthics, Nursing