RT Journal Article SR Electronic T1 Fluoride exposure and indicators of thyroid functioning: study design and data analysis considerations JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP jech-2017-209956 DO 10.1136/jech-2017-209956 A1 Declan Timothy Waugh YR 2017 UL http://jech.bmj.com/content/early/2017/10/09/jech-2017-209956.abstract AB