[1] Teva Pharmaceut, Clin Dev, Frazer, PA USA
[2] Lund Univ, Med, Lund, Sweden
[3] UCSF, Neurol, Palo Alto, CA USA
[4] Albert Einstein Coll Med, Neurol, New York, NY USA
[5] MedVadis Res, Clin Res, Boston, MA USA
[6] Essen Headache Ctr, Neurol, Essen, Germany
[7] Teva Pharmaceut, Stat, Frazer, PA USA
[8] FutureSearch Trials Neurol, Neurol, Austin, TX USA
[9] Jefferson Headache Ctr, Neurol, Philadelphia, PA USA