Meng F, Zhao R, Liu P, Liu L, Liu S- "Assessment of iodine status in children, adults, pregnant women and lactating women in iodine-replete areas of China" PLoS One 8(11):e81294 (2013)
https://journals.plos.org/plosone/artic ... ne.0081294
"Fluoride, a goitrogenic substance in drinking water, is another contributing factor to high GP (goitre prevalence). The fluoride concentration of drinking water was as high as 1.00 mg/kg in Chongqing municipality, which led Chongqing to have the highest GP (18.37%, 18 of 98) amongst all study areas."