1. Clinical Laboratory, National Hospital of Tropical Diseases, Dong Da, Hanoi, Vietnam
2. Sydney Medical School, The University of Sydney, Camperdown, NSW, Australia
3. NSW Health Pathology-Institute of Clinical Pathology and Medical Research, Westmead, NSW, Australia
4. Department of Renal Medicine, Westmead Hospital, Westmead, NSW, Australia
5. Centre for Infectious Diseases and Microbiology-Public Health, Sydney, NSW, Australia