Seasonal variation of serotonin turnover in human cerebrospinal fluid, depressive symptoms and the role of the 5-HTTLPR.

12 Given the highly significant previous seasonal findings, we reasoned that a twice as large study population would provide sufficient power to detect seasonal fluctuations. 12 The same covariates as in a previous study on monoamine metabolite seasonality were incorporated, that is, age and sex for 5-HIAA and weight and lumbar i

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