“…In methodology, other than the limitation of small study population and cross-sectional study design, we were only allowed to access to one factory, instead of applying this project with a multi-center approach, and, also, in lack of blood samples for genetic factors, which had been implied by a study revealing race/ethnicity differences on NIHL prevalence 12) . Further exploration to genetic factors would be the next step for investigations in future, as what also suggested by Kurmis and Apps 2) . It is also possible that there are unidentified organic solvent exposures and fuel compounds coexisting with noise in this industry, which could accelerate the progress of NIHL, reported by previous studies [23][24][25][26][27] .…”