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Authors
de Hoogh, Kees
Flückiger, Benjamin
Probst-Hensch, Nicole
Jeong, Ayoung
Imboden, Medea
Karsies, Aletta
Schmitz, Oliver
Vermeulen, Roel
Kyriakou, Kalliopi
Ndiaye, Aisha
Shen, Youchen
Karssenberg, Derek
Vienneau, Danielle
Hoek, Gerard
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Article History
Received: 17 February 2025
Revised: 31 October 2025
Accepted: 10 December 2025
First Online: 26 December 2025
Competing interests
: The authors declare no competing interests.
: All methods were performed in accordance with the relevant guidelines and regulations. The Dutch tracking campaign received an ethics exemption from the Medische Ethische Toetsingscommissie (METC) Utrecht, as no health-related data was collected from the participating subjects (WAG/mb/20/007879). The Swiss tracking campaign was approved by the Ethikkommission Nordwest- und Zentralschweiz (EKNZ) as it recruited from the EKNZ-approved ongoing COVCO-Basel study (Nr. 2020-00927 and Nr. 2021-01704, respectively). Informed consent was obtained from all participants in the Dutch and Swiss tracking campaigns.
