[1] Teva Pharmaceut, Petah Tiqwa, Israel
[2] Albert Einstein Coll Med, Bronx, NY 10467 USA
[3] Montefiore Headache Ctr, Bronx, NY USA
[4] Harvard Med Sch, Boston, MA USA
[5] Mayo Clin, Rochester, MN USA
[6] Headache Inst, New York, NY USA
[7] Univ Calif Los Angeles, Los Angeles, CA 90024 USA
[8] Jefferson Headache Ctr, Philadelphia, PA USA