Submitted on: 13 February 1999.
Revised on: 09 May 1999.
Accepted on: 01 July 1999.
___________________JOURNAL OF THE AMERICAN MEDICAL INFORMATICS ASSOCIATION
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Submitted on: 01 November 2005.
Revised on: 10 February 2006.
Accepted on: 05 March 2006.
___________________JOURNAL OF THE AMERICAN MEDICAL INFORMATICS ASSOCIATION