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NursingPhysiologyPsychiatryPsychophysiologyBiopotential MeasurementCardiovascular PsychophysiologyDepressionDepressive DisordersHealth PsychophysiologyHeart Rate VariabilityBiofeedbackHeart Rate Variability BiofeedbackHeart Rate Variability IndicesHeart Rate Variability MeasurementNeurofeedbackPilot Study DesignPilot Study Sample Size
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