%0 Journal Article %T Challenges in the design and analysis of sequentially monitored postmarket safety surveillance evaluations using electronic observational health care data %A Platt, Richard %A Carnahan, Ryan %J Pharmacoepidemiology and Drug Safety %V 21 %P 62-71 %@ 1053-8569 %D 2012-01-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve