Reciprocal changes in serum concentration of 3,3’,5’-triiodothyronine (reverse T3) and 3,3’,5’-triiodothy-ronine (T3) in systemic illnesses - Chopra, I. J; Chopra, U; Smith, S. R; Reza, M; Solomon, D. H (J. clin. Endocrinol, 1975)