PT - JOURNAL ARTICLE AU - Nola M. Ries AU - Barbara von Tigerstrom TI - Roadblocks to laws for healthy eating and activity AID - 10.1503/cmaj.091403 DP - 2010 Apr 20 TA - Canadian Medical Association Journal PG - 687--692 VI - 182 IP - 7 4099 - http://www.cmaj.ca/content/182/7/687.short 4100 - http://www.cmaj.ca/content/182/7/687.full SO - CMAJ2010 Apr 20; 182