1. Division of Transfusion Medicine, Department of Laboratory Medicine, Yale School of Medicine, New Haven, Connecticut, USA.
2. Department of Obstetrics and Gynecology, Denver Health Medical Center, Denver, Colorado, USA.
3. Department of Pathology, City of Hope National Medical Center, Duarte, California, USA.
4. Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA.