16. Revenue Sources

The Company’s clinical services customers consist primarily of physicians, hospitals and clinics. Its revenue channels include Medicare, Medicare Advantage, Medicaid, Client Billings (hospitals, etc.), and commercial payers. The following sets forth the net revenue generated by revenue channel accounted for more than 10% of the Company’s revenue from continuing operations during the years ended December 31, 2020 and 2019, respectively. For the years ended December 31, 2020 and December 31, 2019, revenue from Medicare was approximately 50% and 44% of total revenue, respectively.

 Schedule of Revenue by Major Customers