PT - JOURNAL ARTICLE AU - Paul Glasziou AU - Carl Heneghan TI - A spotter’s guide to study designs AID - 10.1136/ebm.14.2.37-a DP - 2009 Apr 01 TA - Evidence Based Medicine PG - 37--38 VI - 14 IP - 2 4099 - http://ebm.bmj.com/content/14/2/37.2.short 4100 - http://ebm.bmj.com/content/14/2/37.2.full SO - Evid Based Med2009 Apr 01; 14