Corrigendum: Obstructive Sleep Apnea Syndrome is Associated with Metabolic Syndrome Among Adolescents and Youth in Beijing: Data from Beijing Child and Adolescent Metabolic Syndrome Study

3390 ETG, the most frequent form of thyroid dysgenesis, refers to the presence of thyroid tissue in locations other than the normal anterior neck region.[1] It remains a rare disease.[1,2] Moreover, females account for 65–80% of ETG cases.[3] Although ETG has been understood gradually, diagnostic delay in ETG remains common, and this delay compounded with inappropriate therapeutic methods is responsible for the poor outcome in affected patients, especially in adolescents and women with childbearing age. When aberrant thyroid was totally excised, thyroid function would be absent or inadequate permanently. Substitute therapy would be essential, cost unpleasantly high and therapeutic period, unfortunately, life‐long time. Thereby, thyroid function test and color Doppler ultrasonography are necessary when PA is considered. If ETG is suspected, preoperative analysis is of particular significance. A high index of clinical awareness and education of clinical practitioners will help a great deal in improving the ultimate outcome in patients with ETG. Financial support and sponsorship The work was supported by grants from the Chinese National Natural Science Fund (No. 30900543), the Clinical Science Fund of PLA General Hospital (No. 2013FC‐TSYS‐1028) and the Beijing Natural Science Fund (No. 7152136).