Study Protocol: It is time to dig deeper: A cross-country implementation mapping study of the iFightDepression® (online self-management) tool - Thomas Rotter; Milica Petrovic; Mikołaj Zarzycki; Caroline Allenhof; Katharina Schnitzspahn; Piotr Toczyski; Azucena Justicia; Saiko Allende Leal; James Chan; Johannes Leimhofer; Katharina Scholze; Stefan Hackel; et al. (PLoS ONE, 2026)