1. Department of Clinical Chemistry, University Medical Center Goettingen, Goettingen, Germany
2. Abbott Laboratories, Abbott Park, IL
3. Department of Clinical Pharmacology and the University of Queensland, Princess Alexandra Hospital, Brisbane, Australia
4. Roche Diagnostics Ltd., Rotkreuz, Switzerland
5. Department of Clinical Chemistry, Cliniques universitaires Saint-Luc, Université catholique de Louvain, LTAP, Brussels, Belgium