Characteristics associated with COVID-19 vaccine uptake among adults aged 50 years and above in England (8 December 2020–17 May 2021): a population-level observational study oleh Nick Andrews, Mary Ramsay, Michael Edelstein, Joanne White, Elise Tessier, Julia Stowe, Colin N J Campbell, Partho Roy, Eleanor Clarke, Jamie Lopez-Bernal, Yuma Rai, Anissa Lakhani, Camille Tsang, Ashley Makwana, Heather Heard, Tim Rickeard, Shreya Lakhani