1. Division of Nephrology University of Virginia Charlottesville Virginia USA
2. Department of Medicine, Division of Nephrology University of California, and Therapeutic Apheresis Program, UCSD Medical Center San Diego California USA
3. Apheresis Research Institute Cologne Germany
4. First Department of Internal Medicine University of Mainz Mainz Germany
5. Department for Pediatrics, St. Anna Kinderspital Medical University of Vienna Vienna Austria
6. Department of Pathology and Laboratory Medicine, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
7. American Red Cross Columbus Ohio USA
8. Department of Pathology and Laboratory Medicine Mayo Clinic Rochester Minnesota USA
9. Department of Pathology Keck School of Medicine of the University of Southern California Los Angeles California USA
10. Department of Pediatric Hematology/Oncology/Neuro‐oncology/Stem Cell Transplant, Ann & Robert H. Lurie Children's Hospital of Chicago Northwestern University Feinberg School of Medicine Chicago Illinois USA
11. Department of Pathology and Cell Biology Columbia University Medical Center New York New York USA
12. Department of Pathology and Laboratory Medicine University of Miami Miami Florida USA
13. Department of Laboratory Medicine and Pathology University of Minnesota Minneapolis Minnesota USA
14. Department of Medicine Seattle Cancer Care Alliance & University of Washington Seattle Washington USA
15. Department of Pathology and Laboratory Medicine Dartmouth‐Hitchcock Medical Center Lebanon New Hampshire USA