1 Department of Clinical Chemistry, Endocrine Laboratory, Amsterdam UMC location Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
2 Amsterdam Gastroenterology, Endocrinology & Metabolism, Amsterdam, The Netherlands.
3 Department of Clinical Chemistry, Endocrine Laboratory, Amsterdam UMC location University of Amsterdam, Amsterdam, The Netherlands.
4 Department of Endocrinology & Metabolism, Amsterdam UMC location University of Amsterdam, Amsterdam, The Netherlands.
5 Laboratory of Hormonal Regulation, Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, 169857, Singapore.
6 Endocrinology, Diabetes, and Metabolism Division, Dept. of Medicine and Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, NC 27710, USA.