| http://www.w3.org/ns/prov#value | - Sensitivity analyses were performed by including only good-quality studies scoring at least 15 points, and by a hypothetical model biased against open surgery in which a single recurrence was assigned to the open surgery group where no events had been reported.Results of the reviewTwenty-nine studies (3,609 patients), of which four were randomised and 25 non-randomised, were included in the review
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