Understanding Respiratory Diagnosis 101, page-9

So? What is your point? Did you not read his introduction?
He's a medical doctor. He has been treating and researching for over 20years. He has explained how (we) can understand PPA and NPA. He sees the benefit of this technology long term. AND then summarises everything in his conclusion.
Crickey @platinumstandard it is a brilliant post! (please don't say he's used keyboard licence)