Submitted on: 18 May 1999.
Revised on: 12 September 1999.
Accepted on: 29 September 1999.
___________________Innere Medizin---SPRINGER MEDIZIN VERLAG GMBH
Submitted on: 16 January 2016.
Revised on: 12 February 2016.
Accepted on: 16 March 2016.
___________________Innere Medizin---SPRINGER MEDIZIN VERLAG GMBH
Submitted on: 31 August 2012.
Revised on: 29 September 2012.
Accepted on: 30 October 2012.
___________________Innere Medizin---SPRINGER MEDIZIN VERLAG GMBH
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Submitted on: 04 September 2011.
Revised on: 27 September 2011.
Accepted on: 19 November 2011.
___________________Innere Medizin---SPRINGER MEDIZIN VERLAG GMBH
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