Clinical Spectrum and Early Renal Functional Variability in a Nationwide Greek Pediatric HNF1B Multicenter Cohort - John Dotis; Argyroula Zampetoglou; Varvara Askiti; Maria Bitsori; Ekaterini Siomou; Chrysoula Kosmeri; Nikoleta Printza; Antonia Kondou; Athina Ververi; Charalampos Kapogiannis; Anastasios Kapogiannis; Despoina Tramma; et al. (Journal of Clinical Medicine, 2026)