Serum BDNF Concentrations Show Strong Seasonal Variation and Correlations with the Amount of Ambient Sunlight

• Marc L. Molendijk ,

  * E-mail: molendijkml@fsw.leidenuniv.nl

  Affiliations Institute of Psychology, Leiden University, Leiden, The Netherlands, Leiden Institute for Brain and Cognition, Leiden University Medical Center, Leiden, The Netherlands

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• Judith P. M. Haffmans,

  Affiliations Institute of Psychology, Leiden University, Leiden, The Netherlands, Parnassia-BAVO Group, Department of Affective Disorders, Medical Chronobiology, PsyQ, The Hague, The Netherlands

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• Boudewijn A. A. Bus,

  Affiliation Department of Psychiatry Radboud University Medical Center, Nijmegen, The Netherlands

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• Philip Spinhoven,

  Affiliations Institute of Psychology, Leiden University, Leiden, The Netherlands, Leiden Institute for Brain and Cognition, Leiden University Medical Center, Leiden, The Netherlands, Department of Psychiatry, Leiden University Medical Center, Leiden, The Netherlands

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• Brenda W. J. H. Penninx,

  Affiliations Department of Psychiatry, Leiden University Medical Center, Leiden, The Netherlands, Department of Psychiatry, EMGO Institute and Neuroscience Campus Amsterdam, VU, Amsterdam, The Netherlands, University Center for Psychiatry, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

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• Jos Prickaerts,

  Affiliation Department of Psychiatry and Neuropsychology, Maastricht University, Maastricht, The Netherlands

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• Richard C. Oude Voshaar,

  Affiliation University Center for Psychiatry, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

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• Bernet M. Elzinga

  Affiliations Institute of Psychology, Leiden University, Leiden, The Netherlands, Leiden Institute for Brain and Cognition, Leiden University Medical Center, Leiden, The Netherlands

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