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Iodine is essential for the synthesis of thyroid hormones. Iodine deficiency can affect human health in different ways, and is commonly referred to as iodine deficiency disorders (IDD). These range from defective development of the central nervous system during the fetal–neonatal life, to goitre in the adult. Only a few countries were completely iodine sufficient before 1990. Since then, a major effort...
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