Exploring the impact of shielding advice on the wellbeing of individuals identified as clinically extremely vulnerable amid the COVID-19 pandemic: a mixed-methods evaluation. - Lasseter, Gemma; Compston, Polly; Robin, Charlotte; Lambert, Helen; Hickman, Matthew; Denford, Sarah; Reynolds, Rosy; Zhang, Juan; Cai, Shenghan; Zhang, Tingting; Smith, Louise E.; Rubin, G James; et al. (BMC Public Health, 2022)