1. Department of Clinical Chemistry, Akademisch Ziekenhuis Vrije Universiteit Brussel, Belgium
2. Department of lnternal Medicine, Akademisch Ziekenhuis Vrije Universiteit Brussel, Belgium
3. Blood Transfusion Center Jette Brussels ,Belgium
4. Department of Clinical Chemistry, Universitair Ziekenhuis,St. Raphael, Leuven, Belgium
5. Department of Biostatistics, Akademisch Ziekenhuis Vrije Universiteit Brussel, Belgium