Hoaas, Hanne, Bente Morseth, Anne E. Holland, and Paolo Zanaboni. “Are Physical Activity and Benefits Maintained After Long-Term Telerehabilitation in COPD?”. International Journal of Telerehabilitation 8, no. 2 (December 15, 2016): 39–48. Accessed September 21, 2021. http://telerehab.pitt.edu/ojs/Telerehab/article/view/6200.