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Article History

Received: 10 June 2017

Accepted: 21 February 2018

First Online: 1 March 2018

Ethics approval and consent to participate

: The study was designed and is being conducted according to the latest version of the Declaration of Helsinki [] and Good Clinical Practice (ICH-GCP (E6)) []. The Institutional Review Board (“Ethik-Kommission der Medizinischen Fakultät der Universität Duisburg-Essen”) of the University Duisburg- Essen gave ethical approval (project approval number: 15–6363-BO) to study design, content and recruitment plans. Written informed consent is being obtained from all enrolled participants and their parents (in case participant is younger than eighteen years) after they had the opportunity to ask all open questions and received a satisfying answer from the study researcher.

: Not applicable.

: The authors declare that they have no competing interest. Dr. B. Scheffler Nachf. GmbH & Co.KG, Bergisch Gladbach, Germany, confirms that it exerts no influence on the results and the evaluation and assessment of the study “Effect of an vitamin D deficiency on depressive symptoms in child and adolescent psychiatric patients – a randomized controlled trial”.

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