Presentation of the different WPs in the STOPSTORM project and their relationships. The early retrospective data collected in WP 1 will serve as base for several other WPs in order to develop workflows and guidelines in WP 2 and sequentially WP 4 and WP 6/9 and sequentially WP 3. WPs 2 and 4 are responsible for benchmarks and audits, credentialing and centralized treatment reviews for QA, while the fully clinical data collected and analysed in WP 1, 3, and 5 are used to establish harmonized quality criteria for STAR in Europe. WP 6–9 are responsible for project management and communication and for clinical and project ethics and other regulatory needs for the prospective validation cohort (WP3) and the accompanying national clinical trials.