No person may practice chiropractic in this State who has not been licensed in accordance with this chapter. Under such rules and regulations as the Board may adopt, this chapter shall not be construed to prohibit the practice of chiropractic by persons who are licensed to practice in any other state, district or foreign country who, as practicing chiropractors, enter this State to consult with a chiropractor of this State. Such consultation shall be limited to examination, recommendation or testimony in litigation.