Investigating the uptake, effectiveness and safety of COVID-19 vaccines: protocol for an observational study using linked UK national data oleh Rachael Wood, Lucy J Griffiths, Ronan A Lyons, Ashley Akbari, Aziz Sheikh, Mark Joy, Simon de Lusignan, John Williams, Siobhan Murphy, Chris Robertson, Richard Hobbs, Gareth Davies, Emily Moore, Colin R Simpson, Emily Lowthian, Rowena Griffiths, Chris Orton, Antony Chuter, Colin McCowan, Eleftheria Vasileiou, Jim McMenamin, Jane Lyons, Fatemeh Torabi, Laura North, Sarah Jane Stock, Utkarsh Agrawal, James Pickett, David Ford, Ruby Tsang, Paul Henery, Steven Kerr, Ting Shi, Dylan McGagh, Declan Bradley, Dermot OReilly, Jillian Beggs, Stuart Bedston, Malorie Perry