It is sometimes performed by physical therapists, chiropractors, osteopaths, and masseurs in Turkish baths. In the U.S. chiropractors obtain a non-medical accredited diploma in the field of chiropractic. The chiropractic subluxation is the heart of the split between "straight" and "mixer" chiropractors. In Australia, there are approximately 2488 chiropractors, or one chiropractor for every 7980 people. In the most restrictive states, SM is limited to chiropractors and medical physicians. The longstanding feud between chiropractors and medical doctors continued for decades. The AMA was accused of limiting the associations between physicians and chiropractors. There were around 50,330 chiropractors practicing in North America in 2000. Practicing medicine without a license led to many chiropractors, including D.D. Palmer, being jailed. Chiropractors, including D.D. Palmer, were jailed for practicing medicine without a license. Chiropractors, especially in America, have a reputation for unnecessarily treating patients. Numerous controlled clinical studies of treatments used by chiropractors have been conducted, with varied results. Chiropractors, including D. D. Palmer, were jailed for practicing medicine without a license. Spinal adjustment is the primary procedure used by chiropractors in the adjustment. The advice chiropractors gave to their patients is often misleading and dangerous.