Disease progression and search for monogenic diabetes among children with new onset type 1 diabetes negative for ICA, GAD- and IA-2 Antibodies by Pörksen, S, Laborie, L, Nielsen, L, Louise Max Andersen, M, Sandal, T, De Wet, H, Schwarcz, E, Aman, J, Swift, P, Kocova, M, Schönle, E, de Beaufort, C, Hougaard, P, Ashcroft, F, Molven, A, Knip, M, Mortensen, H, Hansen, L, Njølstad, P