Decreased hearing levels at frequencies for understanding speech in tannery workers exposed to a high level of trivalent chromium in Bangladesh

Yishuo Gu, Nobutaka Ohgami, M.M. Aeorangajeb Al Hossain, Akira Tazaki, Tomoyuki Tsuchiyama, Tingchao He, Masayo Aoki, Nazmul Ahsan, Anwarul Azim Akhand, Masashi Kato