RT Journal Article SR Electronic T1 Pharmacologic prevention of migraine JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E187 OP E192 DO 10.1503/cmaj.221607 VO 195 IS 5 A1 Tzankova, Velina A1 Becker, Werner J. A1 Chan, Tommy L.H. YR 2023 UL http://www.cmaj.ca/content/195/5/E187.abstract