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Follow-uptimeDrop-outrateOutcomeStudy qualityComments1 day–27months19 patients (33VT) lost tofollow-up, 2 diedExtrusion rate:Shepard and Exmoor: most hadbeen extruded at 6–9 months,all at 15 monthsArrow: 20% lasted longerthan 1 yearShah and Bobbin:all in place at6 months, most between 9–15months, all extruded at 18 monthsArmstrong and Paparella: 80% infunction at 9 months, 50% at 15,10% at 24 monthsSheehy: 66% in function at 15months, 20% at 24 monthsLowInappropiatedescription ofresults.Different placementof tubesnot documentedPartly similarmaterial as inMackenzie 1984[212]Follow-upevery 3rdmonth3% Extrusion time:Exmoor and Shepard:

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