1. Department of Material Physics and Department of Experimental Toxicology and Ecology, BASF SE, Ludwigshafen, Germany
2. Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
3. Institute of Science and Technology for Ceramics, CNR-ISTEC-National Research Council of Italy, Faenza, Italy
4. University of Parma, Parma, Italy