VALIDATION OF A CODE-BASED DATA COLLECTION METHOD IN PRIMARY CARE for Influenza-like illness surveillance in Belgium: Protocol, Nahimana, Mélanie, Bensemmane Sherihane, Rouvez Floriane, Debouverie Laura, Moreels S, De Schreye Robrecht, and Bossuyt Nathalie , 2025, Brussels, belgium, p.74, (2025)