A single centre prospective study of three device-assisted therapies for Parkinson’s disease oleh Hugo Morales-Briceño, Ainhi D. Ha, Han-Lin Chiang, Yicheng Tai, Florence C. F. Chang, David S. Tsui, Jane Griffith, Donna Galea, Samuel D. Kim, Belinda Cruse, Neil Mahant, Victor S. C. Fung