the last paragraph sums it up quite nicely.
http://www.eje-online.org/cgi/content/abstract/156/4/403
Chronic iodine excess does not increase the incidence of hyperthyroidism: a prospective community-based epidemiological survey in China
Fan Yang1, Zhongyan Shan, Xiaochun Teng, Yushu Li, Haixia Guan, Wei Chong1, Di Teng1, Xiaohui Yu1, Chenling Fan1, Hong Dai1, Yang Yu1, Rong Yang1, Jia Li1, Yanyan Chen1, Dong Zhao1, Jinyuan Mao1 and Weiping Teng
Department of Endocrinology and Metabolism, First Affiliated Hospital, China Medical University, No.155 Nanjing Bei St., Heping Dist ...
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