Chiropractic education originally began with a few months of training for chiropractic spinal manipulation. Evidence to support the use of hyperbaric oxygen therapy and chiropractic therapy is lacking. These include&colon; dietary changes, massage, animal therapy, chiropractic and naturopathy, among others. Mencken was a supporter of scientific progress, and was critical of osteopathy and chiropractic. The evidence for chiropractic care and spinal manipulation is mixed. Most who seek chiropractic care do so for low back pain. Research suggests that radiology instruction given at chiropractic schools worldwide seem to be evidence-based. Diversified is the only spine manipulation technique taught in Canadian chiropractic programs. In August 2019 center for therapeutic massage and chiropractic was opened. It is the most common and primary intervention used in chiropractic care. It remains controversial within certain segments of the veterinary, and chiropractic profession. The efficacy of maintenance care in chiropractic is unknown. Diversified is also the technique most preferred for use during future practice by chiropractic students. Regulations for chiropractic practice vary considerably from country to country. Adverse effects are poorly reported in recent studies investigating chiropractic manipulations.