下列何種手術是耳硬化症(otosclerosis)之治療方法?
耳膜成形術(myringoplasty)
修正式乳突切除術(modified radical mastoidectomy)
鐙骨切除術(stapedectomy)併人工鐙骨置放術
頂鼓室鑿開術(atticotomy)