PT - JOURNAL ARTICLE AU - Paul Christopher Webster TI - Medical procedure patents worry trade agreement critics AID - 10.1503/cmaj.109-4764 DP - 2014 May 13 TA - Canadian Medical Association Journal PG - E224--E224 VI - 186 IP - 8 4099 - http://www.cmaj.ca/content/186/8/E224.short 4100 - http://www.cmaj.ca/content/186/8/E224.full SO - CMAJ2014 May 13; 186