Explainable AI in medical imaging: an interpretable and collaborative federated learning model for brain tumor classification - Mastoi, Qurat-ul-ain; Latif, Shahid; Brohi, Sarfraz; Ahmad, Jawad; Alqhatani, Abdulmajeed; Alshehri, Mohammed S.; Al Mazroa, Alanoud; Ullah, Rahmat (Frontiers in Oncology, 2025)