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A critical look at the British randomised clinical trial: Meade TW, Dyer S et al 1990. Low Back Pain of Mechanical Origin. Randomised Comparison of Chiropractic and Hospital Outpatient Treatment, BMJ 300: 1431-37; and the follow up study: Meade T W, Dyer S et al 1995. Randomised Comparison of Chiropractic and Hospital Outpatients Management for Low Back Pain Results from Extended Follow Up, BMJ 311: 349-351. Also contains critical comment on the UK BEAM trial 2004, and others.
NOTE: Chiropractors often cite these studies as proof that chiropractic is "effective, cost-effective, and safe".