Dose-Response Relationship, DrugTime FactorsDrug Administration SchedulePhotochemotherapyPhotosensitizing AgentsPharmaceutical PreparationsMisonidazoleAdministration, OralClinical Trials, Phase I as TopicNitroimidazolesDose-Response Relationship, RadiationAntineoplastic AgentsDouble-Blind MethodOxytropisDrug Delivery SystemsTreatment Outcome