Data from other sources
includes citizens who have taken a COVID-19 vaccination, who have a Danish civil registration number, are alive and have an active address in Denmark on the date of the data extraction, as well as people who were alive and had an active address in Denmark on 27 December 2020 (vaccination data).
https://www.dst.dk/en/TilSalg/data-til-forskning/generelt-om-data/data-fra-andre-kilder