For the purpose of this act the following persons shall be deemed to be engaged in the practice of osteopathy or to be osteopathic physicians and surgeons:
(a) Persons who publicly profess to be osteopathic physicians, or publicly profess to assume the duties incident to the practice of osteopathy, as heretofore interpreted by the supreme court of this state, shall be deemed to be engaged in the practice of osteopathy.
(b) Osteopathic physicians and surgeons shall mean and include those persons who receive a license to practice medicine and surgery pursuant to the provisions of this act.