46% of Doctors to Quit or Retire Early From ObamaCare: New England Journal of Medicine

The Union Leader reports:

You might not be able to keep your current insurer or doctor, as Obama promised. The bill taxes insurance plans the government deems too generous, discouraging them. And a study reported in the New England Journal of Medicine last week showed that 46 percent of physicians surveyed said they would be more likely to quit medicine or retire early if the bill passed.

Did CBO estimates grasp the diminished supply of doctors?