| http://www.w3.org/ns/prov#value | - The sub-jects also completed the following questionnaires: the EpworthSleepiness Scale (ESS), the Fatigue Severity Scale (FSS), theToronto Hospital Alertness Test (THAT), the Illness Intrusive-ness Rating Scale (IIRS) and the Center for EpidemiologicStudies-Depression (CES-D) Scale.The ESS is a self-report questionnaire, which assessessubjective sleepiness and relies on dozing behavior in eightdif
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