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. Author manuscript; available in PMC: 2018 Dec 1.
Published in final edited form as: J Occup Environ Med. 2017 Dec;59(Suppl 12):S13–S21. doi: 10.1097/JOM.0000000000001197

Figure 2.

Figure 2

Eligible TDI workers who volunteered to participate, both initially and after data collection began, and who did not volunteer to participate or did not provide data