RT Journal Article SR Electronic T1 Evaluation of an Immunoextraction Procedure for the Estimation of Free Thyroxine Concentration JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 188 OP 196 VO 25 IS 2 A1 Lynn R. Witherspoon A1 Stanton E. Shuler A1 Susan S. Gilbert YR 1984 UL http://jnm.snmjournals.org/content/25/2/188.abstract AB