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Ng has an active consulting agreement with Medtronic and Johnson & Johnson as proctor\/lecturer.Paul Enochs reports personal fees and other from Medtronic, outside the submitted work.All other authors have no conflicts of interests to declare.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of Interest"}},{"value":"We certify that the manuscript did not involve the use of animal or human subjects.Since this is a retrospective study, formal consent is not required for this type of study.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Statement of Human and Animal Rights"}}]}}