RT Journal Article SR Electronic T1 Beyond Blackberry Thumb JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP cmaj.109-4395 DO 10.1503/cmaj.109-4395 A1 Bonnie O'Sullivan YR 2013 UL http://www.cmaj.ca/content/early/2013/02/04/cmaj.109-4395.abstract AB