Feasibility will be measured by the amount of time the subject spends using the StressEraser. The StressEraser logs the date, time, and duration of use. It also logs the amount of resonant frequency breathing achieved, which is the resonance between the respiratory and baroreflex rhythms, the two primary sources of cardiac stimulation. This information can be easily downloaded from the StressEraser device. The feasibility measures will be total duration of use and total number of resonant frequency respirations.