¹Montanuniversität Leoben; ²Chair of Materials Physics, Leoben (Austria); ³Erich Schmid Institute of Materials Science, Leoben (Austria); ⁴Institute of Bioproducts and Paper Technology, Graz (Austria); ⁵Departament de Biologia Cel•lular, Fisiologia i Immunologia, Barcelona (Spain); ⁶Department of Mechanical Engineering and Materials Science, New Haven (United States); ⁷School of Biomolecular and Biomedical Science, Dublin (Austria)