1. Department of Pathology; University of Pittsburgh Medical Center; Pittsburgh PA USA
2. Department of Pathology; Southern California Permanente Medical Group; Woodland Hills CA USA
3. Department of Pathology; Virginia Mason Medical Center; Seattle WA USA
4. Department of Pathology and Laboratory Medicine; University of Ottawa; Ottawa ON Canada
5. Department of Medicine; University of Pittsburgh Medical Center; Pittsburgh PA USA
6. Department of Pathology; University Health Network; Toronto ON Canada