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Demographic details of controls and patient groups
No. Age (mean) Sex (female/male)
Controls 13 67.6 ± 10.5 8:5
IPS 12 66.3 ± 7.8 2:10
MSA-P 10 62.5 ± 8.5 5:5
PSP 9 67.0 ± 4.3 2:7
Total 44 66.0 ± 8.3 17:27

Note:—MSA-P indicates multiple systems atrophy–type Parkinson.
	No.	Age (mean)	Sex (female/male)
Controls	13	67.6 ± 10.5	8:5
IPS	12	66.3 ± 7.8	2:10
MSA-P	10	62.5 ± 8.5	5:5
PSP	9	67.0 ± 4.3	2:7
Total	44	66.0 ± 8.3	17:27