Minimal cardiac effects in asymptomatic athyreotic patients chronically treated with thyrotropin-suppressive doses of L-thyroxin. - Shapiro,L.E.; Sievert,R.; Ong,L.; Ocampo,E.L.; Chance,R.A.; Lee,M.; Nanna,M.; Ferrick,K.; Surks,M.I. (J Clin Endocrinol Metab, 1997)