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Submitted on: 30 June 1999.
Revised on: 13 October 1999.
Accepted on: 09 December 1999.
___________________Clinical Medicine & Research---MARSHFIELD CLINIC
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Submitted on: 07 November 2022.
Revised on: 23 December 2022.
Accepted on: 19 January 2023.
___________________Clinical Medicine & Research---MARSHFIELD CLINIC