Any chiropractic physician licensed under this Act shall be permitted to take the examination for licensure as a physician to practice medicine in all its branches and shall receive a license to practice medicine in all of its branches if he or she shall successfully pass such examination, upon proof of having successfully completed in a medical college, osteopathic college or chiropractic college reputable and in good standing in the judgment of the Department, courses of instruction in materia medica, therapeutics, surgery, obstetrics, and theory and practice deemed by the Department to be equal to the courses of instruction required in those subjects for admission to the examination for a license to practice medicine in all of its branches, together with proof of having completed (a) the 2 year course of instruction in a college of liberal arts, or its equivalent, required under this Act, and (b) a course of postgraduate clinical training of not less than 24 months as approved by the Department.