Eggermont, E., Vanderschueren, M., Smeets, E., Vanacker, G., Jaeken, J., Devlieger, H., De Nayer, P.-P., & Beckers, C. (1981). Transitory Euthyroid Sick Syndrome in Preterm Infants of Fetal Age Less-than 31 Weeks. Pediatric Research : international journal of human developmental biology, 15(12), 1538. https://doi.org/10.1203/00006450-198112000-00020 (Original work published 1981)