Pringsheim Tamara, Davenport W Jeptha, Becker Werner J
Department of Clinical Neurosciences, University of Calgary, Calgary Headache Assessment and Management Program, Foothills Medical Centre, 1403-29th St. NW, Calgary AB T2N 2T9.
CMAJ. 2010 Apr 20;182(7):E269-76. doi: 10.1503/cmaj.081657. Epub 2010 Feb 16.