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Crowley, Stephanie J; Van Reen, Eliza; LeBourgeois, Monique K; Acebo, Christine; Tarokh, Leila; Seifer, Ronald; Barker, David H; Carskadon, Mary A (2014). A Longitudinal Assessment of Sleep Timing, Circadian Phase, and Phase Angle of Entrainment across Human Adolescence. PLoS ONE, 9(11), e112199. Public Library of Science 10.1371/journal.pone.0112199