1. Department of Neurology University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
2. Department of Neurology Translational Center for Excellence for Neuroepidemiology and Neurological Outcomes Research University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
3. Center for Pharmacoepidemiology Research and Training University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
4. Center for Clinical Epidemiology and Biostatistics University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
5. Department of Biostatistics, Epidemiology, and Informatics University of Pennsylvania Perelman School of Medicine; Philadelphia Philadelphia Pennsylvania USA