title: How common was 2009 pandemic influenza A H1N1?
authors: Centre for Infectious Diseases and Microbiology Laboratory Services, Institute of Clinical Pathology and Medical Research, Westmead Hospital, Westmead, NSW 2145, Australia. jen.kok@swahs.health.nsw.gov.au
authors: Jen
authors: J
authors: Kok
authors: Dominic E
authors: DE
authors: Dwyer
authors: Dominic E
authors: DE
authors: Dywer