1. Department of Pediatric Hematology/Oncology, Weill Cornell Medical College, New York, NY;
2. Department of Internal Medicine, Østfold Hospital Trust Fredrikstad, Fredrikstad, Norway;
3. Department of Internal Medicine, Henri Mondor University Hospital, Assistance Publique–Hôpitaux de Paris, UPEC, Créteil, France; and
4. Departments of Pathology and Laboratory Medicine and
5. Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA