With its promise of virtual care in all 50 states, this is the first time a big tech firm will be directly in the healthcare services business. Will it be another failed experiment, or the breakthrough we've been waiting for?

Health systems that refuse to see themselves as engineering houses risk falling behind in their ability to properly leverage artificial intelligence and machine learning.

What still seems to be missing from the criteria is any assessment of the evidence of how well a product works and to what extent, says Prof Sam Shah, chief medical strategy officer, Numan.