Acupuncture in patients with tension-type headache: randomised controlled trial

Trial centres contributing to the main analysis

Hospital outpatient units:

Centre for Complementary Medicine Research, Department of Internal Medicine II, Technische Universität München, Munich (A Eustachi, N Gerling, JJ Kleber); Department of Complementary Medicine and Integrative Medicine, Knappschafts-Krankenhaus Essen (G Dobos, A Füchsel, I Garäus, C Niggemeier, L Tan); Department of Anaesthesiology, Kreiskrankenhaus Altötting (H Bettstetter, N Schraml); Department of Anaesthesiology, Ludwig-Maximilians-University Munich (D Irnich, K Zimmer); Dr.-Köhler-Park-Kliniken, Bad Elster (A Gruber, J Saha, S Sedlatschek); Hospital for Traditional Chinese Medicine Kötzting (S Hager, U Hager, S Ma, Y Tiann); Pain Unit Marien-Krankenhaus Lünen (A Lux).

Private practices:

G Ahrens, Hausham; C Ammann, Berlin; J Bek, Berlin; A Behrendt, Potsdam; K Beyer, Dobra; KJ Driller, Dortmund; I Eiswirth, Velbert; CH Hempen, J Hummelsberger, H Leonhardy, R Nögel, Munich; A Jung, Berlin; AM Kronseder, Munich; I Kuleschowa, Berlin; V Lerke, Prien; B Linder, Berlin; C Luckas, Nussdorf; A Mietzner, Berlin; J Schäfers, Mönchengladbach; C Schmitt, U Stumpf, Munich; Y von Hasselbach, Munich; U and F Viehweger, Cologne; A Wiebrecht, Berlin.