Result of audiometric testing of different groups of MSWL workers at frequencies of 2000, 3000 and 4000 Hz in either ear. LiuYuewei WangHaijiao WengShaofan SuWenjin WangXin GuoYanfei YuDan DuLili ZhouTing ChenWeihong ShiTingming 2015 <p>Result of audiometric testing of different groups of MSWL workers at frequencies of 2000, 3000 and 4000 Hz in either ear.</p>