RT Journal Article SR Electronic T1 A 32-year-old woman with headache JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E533 OP E534 DO 10.1503/cmaj.160112 VO 188 IS 17-18 A1 William Jeptha Davenport A1 Tamara M. Pringsheim YR 2016 UL http://www.cmaj.ca/content/188/17-18/E533.abstract AB