Privacy-enhancing technologies in federated learning for the internet of healthcare things: a survey - Mosaiyebzadeh, Fatemeh; Pouriyeh, Seyedamin; Parizi, Reza M; Sheng, Quan Z; Han, Meng; Zhao, Liang; Sannino, Giovanna; Ranieri, Caetano Mazzoni; Ueyama, Jó; Batista, Daniel Macêdo (Electronics, 2023)