How frequently should a patient taking amiodarone be screened for thyroid dysfunction? - Pazin-Filho, Antônio; Jesus, A. M. X. de; Magalhães, P. K. R.; Melato, L. H.; Campos, D.; Maciel, Benedito Carlos; Maciel, Léa Maria Zanini (Brazilian Journal of Medical and Biological Research, 2009)