1. Division of Hematology, Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Hong Kong, ROC
2. Departments of Medicine, and Pathology, Boston University, School of Medicine, Boston, MA
3. Departments of Pediatrics, and Children’s Medical Institute, National University of Singapore, and Hospital, Singapore
4. Department of Pathology, Hong Kong Sanatorium, and Hospital, Hong Kong, ROC