Acupuncture for patients with migraine: a randomized controlled trial - Linde, K; Streng, A; Jürgens, S; Hoppe, A; Brinkhaus, B; Witt, C; Wagenpfeil, S; Pfaffenrath, V; Hammes, MG; Weidenhammer, W; Willich, SN; Melchart, D (JAMA, 2005)