xGNN4MI: explainability of graph neural networks in 12-lead electrocardiography for cardiovascular disease classification. - Miriam Cindy Maurer; Philip Hempel; Kristin Elisabeth Steinhaus; Hryhorii Chereda; Marcus Vollmer; Dagmar Krefting; Nicolai Spicher; Anne-Christin Hauschild (npj Digit. Medicine, 2026)