1 Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA.
2 Department of Pathology, University of California San Diego, La Jolla, California, USA.
3 Ethics Consultation Service & Pulmonary & Critical Care Medicine Section, Veterans Affairs Loma Linda Healthcare System, Loma Linda, California, USA.
4 Division of Pulmonary and Critical Care Medicine, Department of Medicine, Loma Linda University School of Medicine, Loma Linda, California, USA.
5 Division of Transfusion Medicine, Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
6 Division of Hematology/Oncology, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
7 Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.