Guidelines for controlled trials of drugs in migraine: second edition.

TFELT HANSEN, P; Block, G; Dahlof, C; Diener, Hc; Ferrari, Md; Goadsby, Pj; Guidetti, Viviana; Jones, B; Lipton, Rb; Massiou, H; Meinert, C; Sandrini, Giorgio; Steiner, T; Winter, Pb; INTERNATIONAL HEADACHE SOCIETY CLINICAL TRIALS, Subcommittee