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Jeff Lavigne plans to use a tax refund this year for long-delayed medical help.
Yet his refund, almost $2,700, has been in limbo since mid-March, when Lavigne filed his tax return, records show.
The IRS flagged the return for potential identity theft — as it did for nearly 2 million Americans last year.
The money has been withheld until Lavigne can verify his identity. The process has proven difficult — phone lines are clogged and online authentication is…