Artificial intelligence in health systems of the WHO European region: implementation, applications, opportunities, and barriers. - Keyrellous Adib; Hanna Emilia Dunning; Nicholas Letchford; Nagui Salama; Yiannos Tolias; Jerome De Barros; Natasha Azzopardi-Muscat; Hans Henri P. Kluge; David Novillo-Ortiz (Int. J. Medical Informatics, 2026)