Overview of BioASQ 2025: The Thirteenth BioASQ Challenge on Large-Scale Biomedical Semantic Indexing and Question Answering. - Anastasios Nentidis; Georgios Katsimpras; Anastasia Krithara; Martin Krallinger; Miguel Rodríguez-Ortega; Eduard Rodriguez-López; Natalia V. Loukachevitch; Andrey Sakhovskiy; Elena Tutubalina; Dimitris Dimitriadis; Grigorios Tsoumakas; George Giannakoulas; et al. (CLEF, 2025)