Submitted on: 28 August 2009.
Revised on: 22 November 2009.
Accepted on: 30 December 2009.
___________________Innere Medizin---SPRINGER MEDIZIN VERLAG GMBH
Submitted on: 11 September 2002.
Revised on: 07 December 2002.
Accepted on: 04 January 2003.
___________________Innere Medizin---SPRINGER MEDIZIN VERLAG GMBH
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Submitted on: 24 May 2001.
Revised on: 14 September 2001.
Accepted on: 06 October 2001.
___________________Innere Medizin---SPRINGER MEDIZIN VERLAG GMBH
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