1Laboratory for Materials Science, Fachhochschule Regensburg, University of Applied Sciences Regensburg, Galgenbergstrasse 30, 93053 Regensburg, Germany
2Lehrstuhl für Werkstoffkunde (Materials Science), University of Paderborn, Pohlweg 47-49, 33098 Paderborn, Germany
3Trinity Centre for Bioengineering, Mechanical Engineering Department, Trinity College, Dublin 2, Ireland