- Serum levels of T4, T3, reverse T3, 3,3'-diiodothyronine and 3',5'-diiodothyronine in obesity, before and after jejuno-ileal bypass. Faber, J., Sørensen, T.I., Lumholtz, I.B., Klein, H.C., Kirkegaard, C., Blickert-Toft, M. Clin. Endocrinol. (Oxf) (1981)