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Daniel F Kripke*, Katharine M Rex, Sonia Ancoli-Israel, Caroline M Nievergelt, Walt Klimecki and John R Kelsoe
* Corresponding author: Daniel F Kripke Kripke.Daniel@ScrippsHealth.org
Journal of Circadian Rhythms 2008, 6:6 doi:10.1186/1740-3391-6-6