The clinically extremely vulnerable to COVID: Identification and changes in healthcare while self-isolating (shielding) during the coronavirus pandemic. oleh Jessica Butler, Mintu Nath, Dimitra Blana, William Ball, Nicola Beech, Corri Black, Graham Osler, Sebastien Peytrignet, Magdalena Rzewuska, Katie Wilde, Artur Wozniak, Simon Sawhney