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The ESS and the ESS-CHAD are both subject to copyright. A license is required to use the ESS or the ESS-CHAD, whether or not a license fee is payable. Some users of the ESS have to pay a license fee, others do not.
All matters in relation to use of these questionnaires, the issuance of licenses for their use, and the provision of translations into languages other than English are handled by Mapi Research Trust, in France. They are Dr Johns’ agents, worldwide.
Contact for the ESS:
https://eprovide.mapi-trust.org/instruments/epworth-sleepiness-scale
Contact for the ESS-CHAD:
https://eprovide.mapi-trust.org/instruments/epworth-sleepiness-scale-child-adolescent
Address: Mapi Resarch Trust,
27 Rue de la villette
69003, Lyon
France
Phone: +33 (0) 4 7213 6575
Fax: +33 (0) 4 7213 6682
Email: PROinformation@mapigroup.com