• There are no rigid dividing lines in medical practice to which a physician is compelled to conform. The American boards, while limiting the practice of their diplomates, do not actually specify the boundary of limitations. Training and dexterity should be the basis for the doctor setting his own perimeter of practice. Dermatological practice provides perhaps the best example of the lack of dividing lines in its relationship to all the other fields of medicine.
Wilson JW. DIVIDING LINES IN SPECIALIZED MEDICAL PRACTICE. JAMA. 1956;162(11):1024–1028. doi:10.1001/jama.1956.02970280004002