Lower prevalence of mild hyperthyroidism related to a higher iodine intake in the population: prospective study of a mandatory iodization programme - Vejbjerg, P; Knudsen, N; Perrild, H; Laurberg, P; Carle, A; Pedersen, I B; Rasmussen, L B; Ovesen, L; Jorgensen, T (Clin Endocrinol (Oxf), 2009)