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1 Hospital for Children and Adolescents, University of Leipzig, Liebigstr. 21, D 04103, Leipzig, Germany. Electronic address: Wieland.Kiess@medizin.uni-leipzig.de.
2 Department of Pediatrics and Adolescent Medicine, Vienna Bone and Growth Center, Medical University of Vienna, A 1090, Vienna, Austria.
1 Hospital for Children and Adolescents, University of Leipzig, Liebigstr. 21, D 04103, Leipzig, Germany. Electronic address: Wieland.Kiess@medizin.uni-leipzig.de.
2 Department of Pediatrics and Adolescent Medicine, Vienna Bone and Growth Center, Medical University of Vienna, A 1090, Vienna, Austria.