Iodine deficiency French, the term "crétin des Alpes" also became current, since the condition was observed in remote valleys of the Alps in particular. The word "cretin" appeared in English in 1779. While reporting recent progress towards overcoming iodine-deficiency disorders worldwide, "The Lancet" noted: "According to World Health Organization, in 2007, nearly 2 billion individuals had insufficient iodine intake, a third being of school age." A conclusion was made that the single most preventable cause of intellectual disability is that of iodine deficiency. There is preliminary evidence that iodine deficiency enhances the sensitivity of breast tissue to estrogen. In rats treated with
Trace field of a representation algebra formula_12 is then as simple as possible, more precisely: The algebra formula_12 is called the quaternion algebra of formula_4. The quaternion algebra of formula_7 is called the "invariant quaternion algebra" of formula_4, denoted by formula_24. As for trace fields, the former is not the same for all groups in the same commensurability class but the latter is. If formula_4 is an arithmetic Fuchsian group then formula_26 and formula_24 together are a number field and quaternion algebra from which a group commensurable to formula_4 may be derived. The theory for Kleinian groups (discrete subgroups of formula_29) is mostly similar as