Like all primary health care providers, doctors of chiropractic undergo extensive education and training before becoming licensed professionals. Students begin by fulfilling undergraduate degree requirements, with a strong emphasis on the core sciences such as chemistry, anatomy, physiology, and physics. The professional program leading to the Doctor of Chiropractic degree is very demanding. Chiropractic students continue their study of the sciences, including pathology and biochemistry, at a highly detailed level. Their education continues into the advanced clinical sciences including orthopedics, neurology, examination procedures, differential diagnosis, and X-ray interpretation. During this entire process, aspiring doctors of chiropractic gain knowledge of the philosophy and practice of health care and chiropractic. Doctors of chiropractic refine their technical adjusting skills in technique classes. During clinical internships student doctors perfect these skills. Finally, all doctors of chiropractic must pass the rigorous national board exams and state exams before entering the field.