King's College London

Funding Information: KRC declares grant support from Bial, Britannia, AbbVie, UCB, GKC, EU Horizon 2020, Parkinson's UK, NIHR, Parkinson's Foundation, Wellcome Trust, Kirby Laing Foundation, and MRC; has served as an advisory board member for, received consultancy and speaking fees from, and declares travel support from, AbbVie, UCB, GKC, Bial, Cynapsus, Lobsor, Stada, Zambon, Profile Pharma, Synovion, Roche, Theravance, Scion, Britannia, Acadia, 4D Pharma, and Medtronic; reports royalties or licenses from Oxford and Cambridge publishers (books) and the Mapi Institute (KPPS, PDSS 2); and has received payment for expert testimony from GMC. VL declares honoraria for speaking and manuscript writing from Britannia.