Classification of type 1 diabetes and type 2 diabetes based on administrative registry data: a nationwide study from Norway - Paz Lopez-Doriga Ruiz; Lars C. Stene; Karianne Fjeld Løvaas; Grethe Åstrøm Ueland; Tone Vonheim Madsen; Kåre I Birkeland; Hanne Løvdal Gulseth; Robert Wiik; Kjersti Nøkleby; Inger Johanne Bakken (Scandinavian Journal of Public Health, 2026)