1 Institute for Occupational and Maritime Medicine (ZfAM), University Medical Center Hamburg-Eppendorf, Seewartenstrasse 10, 20459, Hamburg, Germany. s.mache@uke.de.
2 Institute of Occupational Medicine, Social Medicine and Environmental Medicine, Goethe-University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany. s.mache@uke.de.
3 Institute of Occupational Medicine, Charité-Universitätsmedizin Berlin, Free University and Humboldt University, Thielallee 69-73, 14195, Berlin, Germany.
4 Institute of Occupational Medicine, Social Medicine and Environmental Medicine, Goethe-University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany.