[1] Albert Einstein Coll Med, Dept Neurol, Dept Epidemiol & Populat Hlth, Montefiore Headache Ctr, Bronx, NY 10467 USA
[2] Univ Cincinnati, Coll Med, Headache & Facial Pain Ctr, Cincinnati, OH USA
[3] Vedanta Res, Chapel Hill, NC USA
[4] Allergan Plc, Global Med Affairs, Irvine, CA USA
[5] Albert Einstein Coll Med, Montefiore Headache Ctr, Dept Neurol, Bronx, NY 10467 USA
[6] Univ Calif San Francisco, Dept Basic & Clin Neurosci, Inst Psychiat Psychol & Neurosci, San Francisco, CA 94143 USA
[7] NIHR Wellcome Trust Kings Clin Res Facil, Kings Coll, Dept Neurol, London, England