ORCHESTRA relies on standardised medical check-up procedures and data collection for all the contributing partner studies to ensure comparability. One of the first project’s tasks has been to implement an extensive research tool to provide specific details on the characteristics of the available data (quality, completeness, source, and typology) and patients (demographic characteristics, fragile populations). The following graphs show the data initially brought together in ORCHESTRA. Over the course of the project, some of these cohorts have grown and more data was added to ORCHESTRA.