1. Department of Endocrinology and Metabolism; Academic Medical Centre; University of Amsterdam; Amsterdam The Netherlands
2. Department of Internal Medicine; Division of Endocrinology; Erasmus Medical Centre; Rotterdam The Netherlands
3. Laboratory of Endocrinology and Radiochemistry; Academic Medical Centre; University of Amsterdam; Amsterdam The Netherlands
4. Netherlands Institute of Neurosciences; an Institute of the Netherlands Royal Academy of Arts and Sciences; Amsterdam The Netherlands
5. Centre for Endocrinology, Diabetes and Metabolism; School of Clinical and Experimental Medicine; College of Medical and Dental Sciences; University of Birmingham; Birmingham UK