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Results 55 children met inclusion criteria. 28 children (36 ears) were patched with Gelfilm®. 27 children (35 ears) were patched with collagen matrix. Median ages at surgery and duration of intubation were similar in the two groups. There were persistent perforations at 4 weeks in 5/28 children (5/36 ears, 14%) with Gelfilm®, and 3/27 children (3/35 ears, 9%) with collagen matrix. There was no significant difference in the rate of persistent perforation between the two materials by Fisher's exact test by patients (p = 0.7049) or by ears