There are two statistical errors in the paper by Werber et al. (Reference Werber2009) regarding drinking unboiled chlorinated municipal water, for which the authors apologize:

Page 1, Summary (line 6): at the end of the line the text ‘90% (89/90)’ should be replaced by ‘90% (80/89)’.

Page 4, ‘Analytical epidemiological investigation’ section (line 15): at the end of the line the text ‘80 (93%)’ should be replaced by ‘80 (90%)’.