Ultraviolet TherapyPlacental ExtractsNoisePsychoacousticsVitiligoPerceptual MaskingAcoustic StimulationPhototherapyAuditory ThresholdPitch DiscriminationPUVA TherapyPsoriasisAudiometry, Pure-ToneSound LocalizationSignal Detection, PsychologicalErythemaAuditory PerceptionSound SpectrographySkin PigmentationCochlear NerveCochlear NucleusSoundAuditory PathwaysDose-Response Relationship, RadiationAuditory CortexUltraviolet RaysSkin NeoplasmsTime FactorsTreatment Outcome