Lehrer, Paul M. Lehrer, Gevirtz, Richard Gevirtz Heart rate variability biofeedback: How and why does it work? Frontiers in Psychology, 21 July 2014.
Distributors may purchase multiple copies of packages to distribute to learners, and follow their progress. Bulk discounts are below.
| Quantity | Price per voucher |
|---|---|
| 1+ | $0.00 |
| Article & Exam |
| CLICK HERE to add to My Courses |