Article 1 Biofeedback 1 Central autonomic network 1 Cranial electrotherapy stimulation 1 Heart rate variability 1 Hypertension 1 Stress 1 anxiety 1 biofeedback 1 blood pressure regulation 1 cardiovascular autoregulation electrotherapy 1 heart rate variability 1 human 1 hypertension 1 neuromodulation 1 physiological stress 1 prognosis 1 risk factor 1 transcranial electrical stimulation 1 vagus nerve 1