[1] GlaxoSmithKline Inc, NS MDC, Res Triangle Pk, NC USA
[2] Univ Cincinnati, Cincinnati Childrens Hosp Med Ctr, Coll Med, Cincinnati, OH USA
[3] Mercer Univ, Sch Med, Mem Hlth Univ Med Ctr, Savannah, GA USA
[4] Premiere Res Inst, Headache Clin, W Palm Beach, FL USA
[5] Cleveland Clin Fdn, Cleveland, OH 44195 USA
[6] Dallas Pediat Neurol Assoc, Headache Clin, Dallas, TX USA