WHO definitions for reserve antibiotics. - Zanichelli, Veronica; Bartoszko, Jessica; Huttner, Benedikt; Loeb, Mark; Magrini, Nicola; Mendelson, Marc; Sharland, Mike; Tong, Deborah; Ombajo, Loice Achieng; Moja, Lorenzo (Bulletin of the World Health Organization, 2026)