...Only physicians are likely to be regarded as competent to judge the qualifications of potential physicians, so licensing boards in the various states...are typically composed..of physicians,...members of the AMA. The boards, or the state legislatures...give the AMA the power to influence the number of persons admitted to practice (by) lengthy training,...(and) the list of 'approved' schools and hospitals (which) is generally identical with the list issued by the Council on Medical Education and Hospitals of the AMA.