1. Department of Pathology & Laboratory Medicine, Temple University Health System, Philadelphia, Pennsylvania, USA
2. Department of Biostatistics, College of American Pathologists, Chicago, Illinois, USA
3. Laboratory Improvement Programs Proficiency Testing Department, College of American Pathologists, Chicago, Illinois, USA
4. Department of Pathology & Laboratory Medicine, Cleveland Clinic, Cleveland, Ohio, USA
5. Department of Pathology & Laboratory Medicine, University of Vermont Medical Center, Burlington, Vermont, USA
6. Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA