A Survey of Federated Learning From Data Perspective in the Healthcare Domain: Challenges, Methods, and Future Directions oleh Zahraa Khduair Taha, Chong Tak Yaw, Siaw Paw Koh, Sieh Kiong Tiong, Kumaran Kadirgama, Foo Benedict, Jian Ding Tan, Yogendra AL Balasubramaniam