How is tailored implementation undertaken using a self-guided toolkit? Qualitative study of the ItFits-toolkit in the ImpleMentAll project. - Finch, Tracy L.; Potthoff, Sebastian; May, Carl R.; Girling, Melissa; Perkins, Neil; Vis, Christiaan; Bührmann, Leah; Etzelmueller, Anne; van Genugten, Claire Rosalie; Schuurmans, Josien; Piera-Jiménez, Jordi; Rapley, Tim; et al. (Implementation Science, 2024)