RT Journal Article SR Electronic T1 Direct determination of serum T-4 by isotopic exchange: comparison with T-3 and PBI in 1700 cases JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 92 OP 98 VO 101 IS 8 A1 Tabern, D. L. A1 Kearney, J. J. A1 Van Camp, M. F. A1 Lofquist, E. YR 1969 UL http://www.cmaj.ca/content/101/8/92.abstract