Johns MW. A new method for measuring daytime sleepiness: the Epworth sleepiness scale. Sleep 1991; 14(6):540-545.
Dr Johns permits use of the ESS by individual people (including clinicians and researchers) free of charge.
All other users of the ESS, such as Corporations,
Governmental Agencies, and funded groups (eg group practices, hospitals,
not-for-profit organizations, University institutions) must have a
license to use the ESS.
All enquiries about using the ESS, whether free of
charge or under license, should be made to MAPI Research Trust, in Lyon,
France, the organization that has been contracted to manage use of the
ESS worldwide, in English and other languages: www.mapi-trust.org
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