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. Author manuscript; available in PMC: 2014 Jul 2.
Published in final edited form as: JAMA Neurol. 2014 Apr;71(4):463–469. doi: 10.1001/jamaneurol.2013.6239

Figure 1.

Figure 1

Mean (± SD) 24-hour plasma melatonin concentration for: panel A – participants with PD and controls, panel B – PD participants without and with EDS

CT – circadian time (time since wake); EDS – excessive daytime sleepiness