Authors: Stephen D Silberstein; Richard B Lipton; David W Dodick; Frederick G Freitag; Nabih Ramadan; Ninan Mathew; Jan L Brandes; Marcelo Bigal; Joel Saper; Steven Ascher; Donna M Jordan; Steven J Greenberg; Joseph Hulihan Journal: Headache Date: 2007-02 Impact factor: 5.887