1. Division of Endocrinology and Nephrology, University of Leipzig, Leipzig, Germany.
2. Department of Internal Medicine III, Carl Gustav Carus University Hospital, Technische Universität Dresden, Dresden, Germany.
3. Department of Pathology, Odense University Hospital, Odense, Denmark.
4. Qiagen GmbH, Hilden, Germany.
5. Department of Endocrinology and Metabolism, Odense University Hospital, Odense, Denmark.