Low prevalence of thyrotropin receptor mutations in a large series of subjects with sporadic and familial nonautoimmune subclinical hypothyroidism. - Tonacchera,M.; Perri,A.; De Marco,G.; Agretti,P.; Banco,M.E.; Di Cosmo,C.; Grasso,L.; Vitti,P.; Chiovato,L.; Pinchera,A. (J Clin Endocrinol Metab, 2004)