PT - JOURNAL ARTICLE AU - Alan Cassels TI - The Cochrane Collaboration celebrates 20 years AID - 10.1503/cmaj.131213 DP - 2013 Sep 17 TA - Canadian Medical Association Journal PG - 1162--1163 VI - 185 IP - 13 4099 - http://www.cmaj.ca/content/185/13/1162.short 4100 - http://www.cmaj.ca/content/185/13/1162.full SO - CMAJ2013 Sep 17; 185