Lueprasitsakul, W., Lueprasitsakul, P., Bangprathaiya, P. and Bhuripanyo, P. (2013) “Measurement of Serum Free Thyroxine by RIA in Normal Populations and During Pregnancy”, Srinagarind Medical Journal, 4(2), pp. 77–82. available at: https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13486 (accessed: 18 September 2026).