1. Department of Endocrinology, University Hospital, Katholieke Universiteit Leuven, Leuven, Belgium;
2. Diabetes Research Center and University Hospital, Brussels Free University, Brussels, Belgium;
3. Department of Immunohematology and Blood Transfusion and Department of Surgery, Leiden University Medical Center, Leiden, the Netherlands;
4. Department of Endocrinology, University Hospital Brussels, Brussels, Belgium.