Criticism of this new healing technique came from many, especially the medical community, as it did not involve the traditional medical theory of health. For years, chiropractic was discredited, made fun of and even referred to as quackery. A lot of this still goes on today, but, unfortunately, this is due to misunderstanding. Many people do not understand the concept of chiropractic and have only listened to the propaganda that's been broadcast. A conference sponsored by the National Institutes of Health in 1975 spurred the development of chiropractic research, and as a result, in the early 1970's insurance companies started to recognize chiropractic as legitimate health care and allowed claims to be paid for chiropractic care. By the mid 1990s there was a growing scholarly interest in chiropractic, which helped efforts to improve service quality and establish clinical guidelines, further advancing the profession to become the most widely utilized form of health care, outside of mainstream medicine. Chiropractic is well established in the United States and is the third largest health profession, behind medicine and dentistry.