Watzlaf, Valerie R., and Briana Ondich. “VoIP for Telerehabilitation: A Pilot Usability Study for HIPAA Compliance”. International Journal of Telerehabilitation 4, no. 1 (June 6, 2012): 33–36. Accessed December 4, 2021. http://telerehab.pitt.edu/ojs/Telerehab/article/view/6096.