Libuda, Lars http://orcid.org/0000-0003-1603-3133
Timmesfeld, Nina
Antel, Jochen
Hirtz, Raphael
Bauer, Jens
Führer, Dagmar
Zwanziger, Denise
Öztürk, Dana
Langenbach, Gina
Hahn, Denise
Ring, Stefanie
Peters, Triinu
Hinney, Anke
Bühlmeier, Judith
Hebebrand, Johannes
Grasemann, Corinna
Föcker, Manuel
Article History
Received: 23 July 2019
Accepted: 3 January 2020
First Online: 27 February 2020
Compliance with ethical standard
:
: The authors declare no conflict of interest. Dr. B. Scheffler Nachf. GmbH & Co. KG provided vitamin D supplements as well as placebo free of charge. The company was neither involved in designing and conducting the study nor in data analysis, interpretation and manuscript preparation.
: This study was conducted in accordance with the Declaration of Helsinki and with written informed consent of the patients. For participants below 18 years of age, written informed consent was additionally obtained by parents or assigned foster parents, respectively. All patients were informed that participation was completely voluntary. The study was approved by the local Ethics Committee of the University of Duisburg-Essen (No. 15–6363-BO).