1. Telemedicine: Opportunities and Developments in Member States: Report on the Second Global Survey on eHealth 2009 (Global Observatory for eHealth Series, Volume 2);World Health Organization,2010
2. State Telehealth Laws and Reimbursement Policies Report;Center for Connected Health Policy,2020
3. COVID-19 Telehealth Coverage Policies;Center for Connected Health Policy,2020
4. Notification of Enforcement Discretion for Telehealth;Office for Civil Rights (OCR),2020
5. https://www.reportlinker.com/p06195324/U-S-Digital-Health-Market-Size-Share-Trends-Analysis-Report-By-Technology-By-Component-And-Segment-Forecasts.html?utm_source=GNW.