All of this is due to centralization of medical school accreditation and the exclusion of everything but allopathic medicine. There used to be a lot of different kinds of medical schools until the Rockefellers put Flexner up to making his report to centralize everything. Until then, doctors were like every other worker with their own business. They also lived and died by their reputation, which you cannot find on doctors, now. Back then, I guess everybody in town knew who the good doctors were and who the doctors to avoid were. In small towns, you can still find some of that information by word of mouth.