3Martin WR, Wieler M, Gee M. Midbrain iron content in early Parkinson disease [ J ]. Neu- rology, 2008, 70 (16 Pt2): 1411-1417.
4Braak H, Del Tredici K, Rtib U, et al. Staging of brain pathology related to sporadic Parkinson's disease [ J]. Neurobiol Aging, 2003, 24 (2): 197-211.
5Chaudhuri KR, Martinez - Martin P, Seha- pira AH, et al. International multicenter pi- lot study of the first comprehensive self - com- pleted nonmotor symptoms questionnaire for Parkinson's disease: the NMSQuest study [J]. Mov Disord, 2006 , 21 (7): 916- 923.
6Postuma RB, Gagnon JF, Vendette M, et al. Markers of neurodegeneration in idiopathic rapid eye movement sleep bchaviour disorder and Parkinson's disease [J]. Brain, 2009, 132 (Pt 12) : 3298 -3307.