4Hartikainen AL, Sorri M, Anttonen H, et al. Effect of occupa- tional noise on the course and outcome of pregnancy [J]. Scand J Work Environ Health, 1994,20(6) :444-450.
5Lalande NM, Hfitu R, lambert J. Is occupational noise exposure during pergnancy a risk factor of damage to the auditory system of the fetus? [J]. Am J Ind Med, 1986,10(4):427-435.
