A cross-sectional study of hearing thresholds among 4627 Norwegian train and track maintenance workers

Lie, Arve; Skogstad, Marit; Johnsen, Torstein Seip; Engdahl, Bo Lars; Tambs, Kristian
BMJ Open BMJ Publishing Group, BMJ Open 4(10)
http://dx.doi.org/10.1136/bmjopen-2014-005529