A chiropractor may supervise up to five unlicensed persons as chiropractic assistants if such persons have received appropriate training as established by the board by rule promulgated pursuant to section 12-33-107. A chiropractic assistant may perform his or her duties only under the direct supervision of a chiropractor and only in those areas in which the chiropractic assistant has the requisite skill and training. A chiropractic assistant shall not perform a diagnosis, an adjustment, or acupuncture.