Note from FAN: The authors of this study have issued a "corrigendum" to correct several errors in the above analysis. The corrigendum was published in the April 2014 issue of Environmental Science & Policy (volume 38, pages 282-284). The text of the corrigendum is as follows:
In this paper, the first author erroneously used life time exposure data to calculate number of cancer cases while using annual data on cost of fluoridation chemicals to calculate net social costs. Corrections are made
SIR, - In your annotation (Jan 28, p. 203) the preventive action of fluorides on osteoporosis is said to be confirmed by the recent findings of Bernstein et al. While it is quite possible that fluorides may have such an effect, the cited article has several deficiencies which in my opinion are severe enough to cast doubt on the validity of the results.
Of the factors known to influence the development and severity of involutional osteoporosis, age is of prime importance. In the paper under scru
