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Mayo Clinic
Parkinson Study Group
JAMA | September 14, 2021 | Volume: 326 | Issue: 10 | Pages: 926
10.1001/jama.2021.10207
JAMA Neurology | March 25, 2014 | Volume: 71 | Issue: 5 | Pages: 543
10.1001/jamaneurol.2014.131