Chiropractic education consists of four academic years of chiropractic training, as well as a one-year internship at a college clinic. Successful completion of 2 levels of National Boards is required for chiropractors and a third level for those who use physiologic therapeutics in their practice. Part IV is often used for state licensing and tests knowledge of diagnostic imaging, chiropractic technique, and case management. The Chiropractors Council was established under the Chiropractors Registration Ordinance, Chapter 428, Laws of Hong Kong, in 1993. With the enactment of the Chiropractors Registration (Fees) Regulation and the Chiropractors (Registration and Disciplinary Procedure) Rules, Chapter 428 subsidiary legislations A and B, Laws of Hong Kong, registration of the profession of chiropractors commenced on 1 September 2001. Relevant provisions in the Ordinance which prohibit practice of chiropractic by unregistered persons has come into effect on 13 February 2003.