Levodopa Response in Patients With Early Parkinson Disease: Further Observations of the LEAP Study.

Frequin HL, Schouten J, Verschuur CVM, Suwijn SR, Boel JA, Post B, Bloem BR, van Hilten JJ, van Laar T, Tissingh G, Munts AG, Dijk JM, Deuschl G, Lang A, Dijkgraaf MGW, de Haan RJ, de Bie RMA; LEAP Study Group.