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Article Source: Pairwise Measures of Causal Direction in the Epidemiology of Sleep Problems and Depression
Rosenström T, Jokela M, Puttonen S, Hintsanen M, Pulkki-Råback L, et al. (2012) Pairwise Measures of Causal Direction in the Epidemiology of Sleep Problems and Depression. PLoS ONE 7(11): e50841. doi: 10.1371/journal.pone.0050841

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