@article{vieira_2010,  title={Defining reference values for TSH: nearing perfection in a imperfect world},  volume={54},  ISSN={0004-2730},  url={https://doi.org/10.1590/S0004-27302010000700001},  DOI={10.1590/S0004-27302010000700001},  number={7},  journal={Arquivos Brasileiros de Endocrinologia & Metabologia},  publisher={Sociedade Brasileira de Endocrinologia e Metabologia},  author={Vieira, José Gilberto Henriques},  year={2010},  month={Oct},  pages={589–590} }