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Biesenbach studied medicine in munich and berlin f 1987-1994

according to "Handelsblatt".

https://www.handelsblatt.com/arts_und_style/kunstmarkt/klaus-biesenbach-beschleunigtes-leben-seite-2/2944444-2.html

linked by german wiki

https://de.wikipedia.org/wiki/Klaus_Biesenbach#cite_note-2