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Submitted on: 14 January 2009.
Revised on: 17 February 2009.
Accepted on: 16 March 2009.
___________________Dermatologie in Beruf und Umwelt
Submitted on: 15 May 1998.
Revised on: 25 June 1998.
Accepted on: 04 August 1998.
___________________Dermatologie in Beruf und Umwelt