1 Subjects: “...Evaluation Studies as Topic...”

2 “... report included data from 428 articles across the seven key questions. Study quality varied according...”

3 “... stapedectomy or tympanoplasty). Randomized controlled trials with placebo controls or head-to-head trials were...”

4 “... stapedectomy or tympanoplasty). Randomized controlled trials with placebo controls or head-to-head trials were...”

5 “... SOURCES: Medline(r), Embase", AMED, Cochrane Central Register of Controlled Trials, Cochrane Database...”

6 “... SOURCES: Medline(r), Embase", AMED, Cochrane Central Register of Controlled Trials, Cochrane Database...”

7 “... abstracted for 99 studies in six domains. For the RR, the initial literature search yielded a total of 949...”