Burden of influenza infection in hospitalised children below 6 months of age and above in Hong Kong from 2005 to 2011 - Nelson, E. Anthony S.; Ip, Margaret; Tam, John S.; Mounts, Anthony W.; Chau, Sze Lok; Law, Shu Kei; Goggins, William; Simpson, Lucy A.; Chan, Paul K.S. (Vaccine, 2014)