Pepper, Cecily, Reyes-Cruz, Gisela, Pena, Ana Rita, Dowthwaite, Liz, Babbage, Camilla May, Wagner, Hanne Gesine, Nichele, Elena, Fischer, Joel E, "Understanding Trust and Sustained Use or Abandonment after a Year with the NHS Covid-19 Contact Tracing App in the United Kingdom: A Longitudinal Mixed-Method Study", ,