“…Protein-bound iodine (PI) was measured by the method described by Barker [1948] ; this type of determination has been shown by many to determine the status of thyroid function [cf. Salter, Bassett & Sappington, 1941 ;Lowenstein, Bruger & Hinton, 1944;Taurog, Chaikoff & Bennett, 1946;and Wolff, Chaikoff, Taurog & Rubin, 1946].…”