1. From the Department of Pathology, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
2. From the Department of Hemalology/Oncology, Wilford Hall Medical Center, Lackland AFB, San Antonio, Texas
3. From the Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
4. From the Department of Laboratory Medicine and Pathology, Presbyterian Hospital, Charlotte, North Carolina.