Tracking Changes in Mobility Before and After the First SARS-CoV-2 Vaccination Using Global Positioning System Data in England and Wales (Virus Watch): Prospective Observational Community Cohort Study - Vincent Nguyen; Yunzhe Liu; Richard Mumford; Benjamin Flanagan; Parth Patel; Isobel Braithwaite; Madhumita Shrotri; Thomas Byrne; Sarah Beale; Anna Aryee; Wing Lam Erica Fong; Ellen Fragaszy; et al. (JMIR Public Health and Surveillance, 2023)