Andrew J Vickers, Rebecca W Rees, Catherine E Zollman, Rob McCarney, Claire M Smith, Nadia Ellis et al
Vickers Andrew J, Rees Rebecca W, Zollman Catherine E, McCarney Rob, Smith Claire M, Ellis Nadia et al.
Acupuncture for chronic headache in primary care: large, pragmatic, randomised trial
BMJ 2004; 328 :744