BMC Psychiatry

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Seasonal changes, sleep length and circadian preference among twins with bipolar disorder

Reeta Hakkarainen*, Carolina Johansson, Tuula Kieseppä, Timo Partonen, Markku Koskenvuo, Jaakko Kaprio and Jouko Lönnqvist

BMC Psychiatry 2003, 3:6 doi:10.1186/1471-244X-3-6

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