The Impact of Thought Field Therapy on Heart Rate Variability (HRV)
By Roger J. Callahan, PhD.
Hent PDF: Heart-Rate-Variability.pdf

The Heart of Health: Prevent Heart Problems with TFT and Heart Rate Variability
By Roger J. Callahan, PhD.
Hent PDF: The-Heart-of-Health.pdf

Dr. Royal’s Important Discovery
By Roger J. Callahan, PhD.
Hent PDF: Dr-Royals-Important-Discovery.pdf