Feasibility and safety of lumbar puncture in the Parkinson's Disease research participants: Parkinson's Progression Marker Initiative (PPMI).

Prakash N, Caspell-Garcia C, Coffey CS, Siderowf A, Tanner CM, Kieburtz K, Mollenhauer B, Galasko D, Merchant K, Foroud T, Chahine LM, Weintraub D, Casaceli C, Dorsey R, Wilson R, Herzog M, Daegele N, Arnedo V, Frasier M, Sherer T, Marek K, Simuni T, on behalf of the Parkinson's Progression Markers Initiative Steering Committee, Study Cores, Site Investigators, Coordinators, and Industry & Scientific Advisory Board.