PT - JOURNAL ARTICLE AU - Adam Porath TI - Possible patient overlap in studies AID - 10.1503/cmaj.1060242 DP - 2007 Mar 13 TA - Canadian Medical Association Journal PG - 809--809 VI - 176 IP - 6 4099 - http://www.cmaj.ca/content/176/6/809.1.short 4100 - http://www.cmaj.ca/content/176/6/809.1.full SO - CMAJ2007 Mar 13; 176