PT - JOURNAL ARTICLE AU - David Rosen TI - Threshold AID - 10.1503/cmaj.121197 DP - 2013 Feb 19 TA - Canadian Medical Association Journal PG - 272--272 VI - 185 IP - 3 4099 - http://www.cmaj.ca/content/185/3/272.short 4100 - http://www.cmaj.ca/content/185/3/272.full SO - CMAJ2013 Feb 19; 185