The Human Endogenous Circadian System Causes Greatest Platelet Activation during the Biological Morning Independent of Behaviors Scheer, Frank A. J. L. ; Michelson, Alan D. ; Frelinger, Andrew L. ; Evoniuk, Heather ; Kelly, Erin E. ; McCarthy, Mary ; Doamekpor, Lauren A. ; Barnard, Marc R. ; Shea, Steven A. Abstract Publication: PLoS ONE Pub Date: September 2011 DOI: 10.1371/journal.pone.0024549 Bibcode: 2011PLoSO...624549S