Affiliations:
University of Applied Science, HAW Hamburg, Hamburg, Germany
Correspondence:
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Address for correspondence: Prof. Dr. Gerhard J. Suess, University of Applied Science, HAW Hamburg, Alexanderstr. 1, 20099 Hamburg, Germany. Tel./Fax: +49 179 583 8074; E-mail: Gerhard.suess@haw-hamburg.de.