Figure 2.

Description of the literature review performed to construct the OEMD. This flowchart describes the different steps and number of documents identified, included and excluded throughout the literature review carried out to construct the OEMD. (a) This figure includes some books, book chapters or actual measurements (n = 5). (b) This figure includes both published (n = 59) and unpublished articles (n = 3). (c) This rating refers to the full document or sets of measurements within the document. As stated in the text, documents with a rating <1 were included in the database if they made a unique contribution to the exposure assessment.