Effectiveness of influenza vaccination on influenza-associated hospitalisations over time among children in Hong Kong: a test-negative case-control study

Lancet Respiratory Medicine
Dec 2018 Volume 6 Number 12 p885-962  e56-e57
http://www.thelancet.com/journals/lanres/issue/current

Articles
Effectiveness of influenza vaccination on influenza-associated hospitalisations over time among children in Hong Kong: a test-negative case-control study
Shuo Feng, Susan S Chiu, Eunice L Y Chan, Mike Y W Kwan, Joshua S C Wong, Chi-Wai Leung, Yiu Chung Lau, Sheena G Sullivan, J S Malik Peiris, Benjamin J Cowling