Extensive Research Reveals the Most Effective, Safest and Most Cost-effective Treatment For Spinal Problems. It was published in 1993 and appeared on the front page of USA Today. After an extensive review of the international medical literature, as well as interviews with researchers, practitioners and patients, the researchers concluded; "...spinal manipulation by Chiropractors is more effective, safer and more cost-effective than other treatments..." "Many medical therapies are of questionable validity (unproven), some are "unsafe" and even cause complications..."