1. From the Department of Laboratory Medicine and Pathology, Mayo Clinic Arizona, Scottsdale (Snozek).
2. From ARUP Laboratories, Salt Lake City, Utah (McMillin).
3. From the Department of Pathology, University of Utah Health, Salt Lake City (McMillin).
4. From the Biostatistics Department (Nwosu), College of American Pathologists, Northfield, Illinois.
5. From the Proficiency Testing Division (Dizon), College of American Pathologists, Northfield, Illinois.
6. From the Department of Pathology, University of Iowa Hospitals and Clinics, Iowa City (Krasowski).