PT - JOURNAL ARTICLE AU - Mithu Sen AU - Daniel Gregson AU - James Lewis TI - Unnecessary exposure? AID - 10.1503/cmaj.1050211 DP - 2006 Feb 14 TA - Canadian Medical Association Journal PG - 500--500 VI - 174 IP - 4 4099 - http://www.cmaj.ca/content/174/4/500.1.short 4100 - http://www.cmaj.ca/content/174/4/500.1.full SO - CMAJ2006 Feb 14; 174