COVID-19 vaccine effectiveness against the Omicron variant of SARS-CoV-2 in multimorbidity: A territory-wide case-control study by Francisco Tsz Tsun Lai, Vincent Ka Chun Yan, Eric Yuk Fai Wan, Cheyenne I Ying Chan, Cuiling Wei, Franco Wing Tak Cheng, Celine Sze Ling Chui, Xue Li, Carlos King Ho Wong, Ching Lung Cheung, Ian Chi Kei Wong, Esther Wai Yin Chan

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