#34;You have been in Close Contact with a Person Infected with COVID-19 and you may have been Infected#34;: Understanding Privacy Concerns, Trust and Adoption in Mobile COVID-19 Tracing Across Four Countries. - Oksana Kulyk; Lauren Britton-Steele; Elda Paja; Melanie Duckert; Louise Barkhuus (Proc. ACM Hum. Comput. Interact., 2022)