Biofeedback Data Collection Procedure. At sessions 1, 10, and at 3 months, a resting 5-minute heart period using the "vanilla" task will be obtained before commencing biofeedback and at the end of the session. During biofeedback, two 5-minute heart period recordings will be taken, one at the beginning of the session and one at the end. Questionnaire data will then be collected. Patients will be given a $25 payment for participation at the end of each data collection session for a total of $75.