Lower dose prednisone prevents radioiodine-associated exacerbation of initially mild or absent Graves’ orbitopathy: a retrospective cohort study - Lai, A; Sassi, L; Compri, E; Marino, F; Sivelli, P; Piantanida, E; Tanda, M L; Bartalena, L (J Clin Endocrinol Metab, 2010)