They mailed sureys to 20,000 members of the German Tinnitus League. The 4995 indiiduals who participated were also ealuated for audiologic, medical, and psychological factors.

• 他们给德国耳鸣联盟的20000名成员邮局调查问卷，评价了4995名受试者的听力学，医学，生理学因素。