Surveyance of disease frequency in a population by linkage to diagnostic laboratory databases. A system for monitoring the incidences of hyper- and hypothyroidism as part of the Danish iodine supplementation program. - Inge Bülow Pedersen; Peter Laurberg; Terkel Arnfred; Nils Knudsen; Torben Jørgensen; Hans Perrild; Lars Ovesen (Comput. Methods Programs Biomed., 2002)