1. Department of NeurologyPerelman School of Medicine at the University of PennsylvaniaPhiladelphia Pennsylvania USA
2. Department of PsychiatryPerelman School of Medicine at the University of PennsylvaniaPhiladelphia Pennsylvania USA
3. PD Research, Education and Clinical Center, Philadelphia Veterans Affairs Medical CenterPhiladelphia Pennsylvania USA
4. Department of PsychiatryYale University School of MedicineNew Haven Connecticut USA
5. Department of Biostatistics and Computational BiologyUniversity of Rochester Medical CenterRochester New York USA
6. The Institute for Neurodegenerative DisordersNew Haven Connecticut USA
7. Eli Lilly and CompanyIndianapolis Indiana USA