Submitted on: 13 March 2003.
Revised on: 25 June 2003.
Accepted on: 24 July 2003.
___________________Danish Medical Journal---DANISH MEDICAL ASSOC
Submitted on: 31 October 2012.
Revised on: 19 January 2013.
Accepted on: 11 February 2013.
___________________Danish Medical Journal---DANISH MEDICAL ASSOC
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Submitted on: 22 July 2001.
Revised on: 01 October 2001.
Accepted on: 09 November 2001.
___________________Danish Medical Journal---DANISH MEDICAL ASSOC
Submitted on: 16 October 2013.
Revised on: 02 December 2013.
Accepted on: 17 December 2013.
___________________Danish Medical Journal---DANISH MEDICAL ASSOC
Submitted on: 27 October 2006.
Revised on: 24 December 2006.
Accepted on: 24 January 2007.
___________________Danish Medical Journal---DANISH MEDICAL ASSOC
Submitted on: 13 July 1998.
Revised on: 06 November 1998.
Accepted on: 17 November 1998.
___________________Danish Medical Journal---DANISH MEDICAL ASSOC
Submitted on: 29 August 2008.
Revised on: 20 November 2008.
Accepted on: 28 December 2008.
___________________Danish Medical Journal---DANISH MEDICAL ASSOC