An excerpt from the database structure explaining its relational aspects. - Malwina Kotowicz; Magdalena Shumanska; Sven Fengler; Birgit Kurkowsky; Anja Meyer-Berhorn; Elisa Moretti; Josephine Blersch; Gisela Schmidt; Jakob Kreye; Scott van Hoof; Elisa Sánchez-Sendín; S. Momsen Reincke; et al. (2025)