Letter: Thyroid Stimulating Hormone Reference Range and Prevalence of Thyroid Dysfunction in the Korean Population: Korea National Health and Nutrition Examination Survey 2013 to 2015 (Endocrinol Metab 2017;32:106-14, Won Gu Kim et al.).

Letter: Thyroid Stimulating Hormone Reference Range and Prevalence of Thyroid Dysfunction in the Korean Population: Korea National Health and Nutrition Examination Survey 2013 to 2015 (Endocrinol Metab 2017;32:106-14, Won Gu Kim et al.).