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Submitted on: 06 October 1998.
Revised on: 16 December 1998.
Accepted on: 23 January 1999.
___________________JOURNAL OF KOREAN MEDICAL SCIENCE
Submitted on: 29 August 2002.
Revised on: 04 November 2002.
Accepted on: 15 November 2002.
___________________JOURNAL OF KOREAN MEDICAL SCIENCE
Submitted on: 23 April 2003.
Revised on: 23 June 2003.
Accepted on: 06 August 2003.
___________________JOURNAL OF KOREAN MEDICAL SCIENCE
Submitted on: 14 September 2009.
Revised on: 10 November 2009.
Accepted on: 14 December 2009.
___________________JOURNAL OF KOREAN MEDICAL SCIENCE
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