Declaration of interest
The authors declare that they have no actual or potential competing financial interest. Part of this work has been conducted by order of the Ministry of Social Affairs, Public Health and Environment (Belgium), within the scope of the EC Council Regulation (EC)793/93, requiring the risk assessment of existing substances. The funding source played no role in study design; in the collection, analysis, and interpretation of data, the writing of the report or approval of the manuscript, and in the decision to submit the paper for publication. The review strategy, the conduct of the review and the interpretation and synthesis of the findings were exclusively the work of the authors. All authors had full access to all the data in the study and had final responsibility for the decision to submit for publication of the original paper and this Response to a Letter to the Editor.