[1] Univ Calgary, Cumming Sch Med, Dept Pediat, Calgary, AB, Canada
[2] Univ Calgary, Cumming Sch Med, Dept Clin Neurosci, Calgary, AB, Canada
[3] Univ Calgary, Cumming Sch Med, Dept Community Hlth Sci, Calgary, AB, Canada
[4] Alberta Childrens Prov Gen Hosp, Sect Neurol, Calgary, AB, Canada
[5] Univ Cincinnati, Coll Med, Dept Pediat, Cincinnati, OH USA
[6] Cincinnati Childrens Hosp Med Ctr, Div Behav Med & Clin Psychol, Cincinnati, OH 45229 USA
[7] Cincinnati Childrens Hosp Med Ctr, Headache Ctr, Cincinnati, OH 45229 USA