Pilots say those stalls are particularly insidious because pilots cannot see the tail wings and because the recovery procedure is the opposite of a main-wing stall -- tail-wing stalls generally are overcome by raising the plane's nose.

CNN: Source: Wrong move possibly made before Buffalo plane crash

And it's noted the main PRAs have no independent auditing, or complaints procedure to protect against conflict of interest.

BBC: Setting prices crudely

They believe in what they do and reign as the main arbiters of whether an operation should be performed--and insurers pay per procedure.

FORBES: Is elective surgery overdone?