Hauser, RA, F Stocchi, O Rascol, SB Huyck, R Capece, TW Ho, P Sklar, C Lines, D Michelson, and D Hewitt. 2015. “Preladenant As an Adjunctive Therapy With Levodopa in Parkinson Disease: Two Randomized Clinical Trials and Lessons Learned. JAMA Neurol 2015;72:1491-500.”. JAMA Neurol.