Andrew J Vickers, Rebecca W Rees, Catherine E Zollman, Rob McCarney, Claire M Smith, Nadia Ellis et al
Vickers A J, Rees R W, Zollman C E, McCarney R, Smith C M, Ellis N et al.
Acupuncture for chronic headache in primary care: large, pragmatic, randomised trial
BMJ 2004; :bmj;bmj.38029.421863.EBv1
doi:10.1136/bmj.38029.421863.EB