SUR mutation in type 1 diabetes: autoimmunity prevents sulfonylurea rescue of diabetes caused by SUR1 mutation. Results from the Hvidore Study Group by Porksen, S, Laborie, L, Nielsen, L, De Wet, H, Schvarcz, E, Sandal, T, Aman, J, Swift, P, Hougaard, P, Ashcroft, F, Molven, A, Knip, M, Hansen, L, Njolstad, P, Mortensen, H