Seroprevalence of Pandemic H1N1 Antibody among Health Care Workers in Hong Kong Following Receipt of Monovalent 2009 H1N1 Influenza Vaccine. - Ying Zhou; Ng, Diane M. W.; Wing-Hong Seto; Ip, Dennis K. M.; Kwok, Henry K. H.; Ma, Edward S. K.; Ng, Sophia; Lau, Lincoln L. H.; Peiris, J. S. Malik; Cowling, Benjamin J. (PLoS ONE, 2011)