: the devices associated with this report were not returned.Follow up communication for product return was unsuccessful.The investigation could not verify or identify any product contribution to the reported event with the information provided as the reported devices were not returned for evaluation.Based on the inability to identify root cause, the need for corrective action was not indicated.Continue to monitor via (b)(4).Depuy considers the investigation closed at this time.Should the additional information be received, the information will be reviewed and the investigation will be re-opened as necessary.
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