1. Departments of Pathology and Medical and Research Technology, University of Maryland School of Medicine, Baltimore, MD
2. Core Laboratories and Point of Care Services, University of Maryland Medical Center, Baltimore, MD
3. TriCore Reference Laboratories, Albuquerque, NM
4. Core Laboratory, University of New Mexico, Albuquerque, NM
5. Department of Clinical Pharmacology, George-August-University University Medical Center Goettingen, Göttingen, Germany