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For educational and research purposes, we provide this information system free of charge.  Dr. Don Watenpaugh retains copyright for all uses.  If you find it valuable and wish to contribute to its development and maintenance, please:

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We welcome commercial or for-profit licensing of the information system, and we will consider it case-by-case.  Please contact Dr. Watenpaugh at information@sleepconsultants.com. 

Thank you for your interest in this work. 

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