[1] Wayne State Univ, Childrens Hosp Michigan, Detroit Med Ctr, Dept Pediat, Detroit, MI 48202 USA
[2] Wayne State Univ, Childrens Hosp Michigan, Detroit Med Ctr, Dept Neurol, Detroit, MI 48202 USA
[3] Univ Calif San Francisco, Dept Neurol, Headache Grp, San Francisco, CA USA