| http://www.w3.org/ns/prov#value | - Volunteers with self-reported excessive daytime sleepiness (Epworth Sleepiness Scale, score ???11) [47] or a sleep complaint such as sleep apnea or insomnia (Basic Nordic Sleep Questionnaire, items score <4) [48] as well as evidence of psychopathology on the Symptom Check List (SCL-90R score >59) were excluded from the study.
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