Grover S, Kumar Sreelatha AA, Pihlstrom L, Domenighetti C, Schulte C, Sugier PE, Radivojkov-Blagojevic M, Lichtner P, Mohamed O, Portugal B, Landoulsi Z, May P, Bobbili D, Edsall C, Bartusch F, Hanussek M, Krüger J, Hernandez DG, Blauwendraat C, Mellick GD, Zimprich A, Pirker W, Tan M, Rogaeva E, Lang A, Koks S, Taba P, Lesage S, Brice A, Corvol JC, Chartier-Harlin MC, Mutez E, Brockmann K, Deutschländer AB, Hadjigeorgiou GM, Dardiotis E, Stefanis L, Simitsi AM, Valente EM, Petrucci S, Straniero L, Zecchinelli A, Pezzoli G, Brighina L, Ferrarese C, Annesi G, Quattrone A, Gagliardi M, Burbulla LF, Matsuo H, Kawamura Y, Hattori N, Nishioka K, Chung SJ, Kim YJ, Pavelka L, van de Warrenburg BPC, Bloem BR, Singleton AB, Aasly J, Toft M, Guedes LC, Ferreira JJ, Bardien S, Carr J, Tolosa E, Ezquerra M, Pastor P, Diez-Fairen M, Wirdefeldt K, Pedersen NL, Ran C, Belin AC, Puschmann A, Hellberg C, Clarke CE, Morrison KE, Krainc D, Farrer MJ, Kruger R, Elbaz A, Gasser T, Sharma M; and the Comprehensive Unbiased Risk Factor Assessment for Genetics and Environment in Parkinson's Disease (COURAGE-PD) Consortium.