in 26 adolescents between 13 -- 15 years of age living in a region with increased fluoride concentration in drinking water ( 3 ppm = 3 mg naf/l ) bone density-measurements by an i-125 profile scanner as well as measurements of thyroid function by means of numerous in vitro tests ( t3u , t4 , ft4-index , ria-t3 , rt3 , htg , tsh , thyroglobulin and microsomal thyroid antibodies ) have been done .
C0016327
fluoride
C0037508
naf