1. Department of Clinical Chemistry, University of Liège, CIRM, CHU de Liège , Liège , Belgium
2. Clinical Biochemistry Department, KAT General Hospital , Athens , Greece
3. Department of Clinical Chemistry, Endocrine Laboratory, Amsterdam Gastroenterology & Metabolism, Vrije Universiteit Amsterdam and University of Amsterdam, Amsterdam UMC , Amsterdam , the Netherlands
4. Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz , Graz , Austria
5. Laboratoire d’Exploration Fonctionnelles, Hôpital Necker-Enfants Malades , Paris , France