Erratum to: Ozone and childhood respiratory disease in three US cities: evaluation of effect measure modification by neighborhood socioeconomic status using a Bayesian hierarchical approach (Environmental Health: A Global Access Science Source (2017) 16 (36) DOI: 10.1186/s12940-017-0244-2)

Abstract

This article [1] has been updated to include an R code and example dataset as Additional files 2 and 3. The R code and example dataset are also shown below. In addition, the following text has been removed from page 4 of the article: "To demonstrate the methods we used to fit the combined meta-regression, the online supplement includes example R code with an example dataset (example data are not real but are similar in magnitude and structure to the output from the case-crossover analyses in Stage 1".) Finally, the following text is shown in the methods section: To demonstrate the methods we used to fit the combined meta-regression, we have included an R code and example dataset as Additional files 2 and 3 (example data are not real but are similar in magnitude and structure to the output from the case-crossover analyses in Stage 1").