Overcoming data scarcity through multi-center federated learning for organs-at-risk segmentation in pediatric upper abdominal radiotherapy. - Mianyong Ding; Maximilian Knoll; Semi Harrabi; Martine van Grotel; Annemieke S. Littooij; Max van Noesel; Jens-Peter Schenk; Marry M. van den Heuvel-Eibrink; Geert O. R. Janssens; Matteo Maspero (CoRR, 2026)