Hannah Hsu1, Vincent Seah2, Deborah Marriott3, John Moore4. 1. Haematology Department, St Vincent's Hospital Sydney, Darlinghurst, NSW, Australia. Electronic address: hannah_hsu@hotmail.com. 2. Department of Clinical Pharmacology and Toxicology, St Vincent's Hospital Sydney, Darlinghurst, NSW, Australia. 3. Department of Infectious Diseases and Clinical Microbiology, St Vincent's Hospital Sydney, Darlinghurst, NSW, Australia. 4. Haematology Department, St Vincent's Hospital Sydney, Darlinghurst, NSW, Australia.