The Illinois Society of Orthodontists (ISO) is a non-profit organization. ISO is one of the nine state and provinces that is a component of the Midwestern Society of Orthodontists (MSO) which is a constituent of the American Association of Orthodontists (AAO). The association began as the Chicago Association of Orthodontists in 1925 and expanded to be the Illinois Society of Orthodontists in 1965...
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