Swertz M, van Enckevort E, Oliveira JL, Fortier I, Bergeron J, Thurin NH, Hyde E, Kellmann A, Pajouheshnia R, Sturkenboom M, Cunnington M, Nybo Andersen A-M, Marcon Y, Goncalves G, Gini R. Towards an interoperable ecosystem of research cohort and real-world data catalogues enabling multi-center studies. Yearb Med Inform. 2022 Aug;31(1):262-72. doi: 10.1055/s-0042-1742522
Christensen T, Riis AH, Hatch EE, Wise LA, Nielsen MG, Rothman KJ, Toft Sorensen H, Mikkelsen EM. Costs and efficiency of online and offline recruitment methods: a web-based cohort study. J Med Internet Res. 2017 Mar 1;19(3):e58. doi: 10.2196/jmir.6716
Wardman M, Chintakayala PK, de Jong G. Values of travel time in Europe: review and meta-analysis. Transp Res Part A Policy Pract. 2016 Dec;94:93-111. doi: 10.1016/j.tra.2016.08.019