TY - JOUR T1 - Unreadable JF - Canadian Medical Association Journal JO - CMAJ DO - 10.1503/cmaj.111810 SP - cmaj.111810 AU - Daniel J. Heffner Y1 - 2012/01/01 UR - http://www.cmaj.ca/content/early/2012/05/07/cmaj.111810.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -