1. EU Healthy Gateways Joint Action. Advice for restarting cruise ship operations after lifting restrictive measures in response to the COVID-19 pandemic (version 2—April 2021) [cited 2021 Jun 29]. https://www.healthygateways.eu/Novel-coronavirus
2. European Centre for Disease Prevention and Control. Data on country response measures to COVID-19 (archived) [cited 2024 Feb 9]. https://www.ecdc.europa.eu/en/publications-data/download-data-response-measures-covid-19
3. European Centre for Disease Prevention and Control. COVID-19 vaccine tracker [cited 2024 Feb 9]. https://qap.ecdc.europa.eu/public/extensions/COVID-19/vaccine-tracker.html
4. European Centre for Disease Prevention and Control. Data on the daily number of new reported COVID-19 cases and deaths by EU/EEA country [cited 2022 Jul 23]. https://www.ecdc.europa.eu/en/publications-data/data-daily-new-cases-covid-19-eueea-country
5. Stevenson MSE. epiR: tools for the analysis of epidemiological data [cited 2024 Feb 9]. https://CRAN.R-project.org/package=epiR