1. Department of Orthopedic and Trauma Surgery, University Hospital Erlangen, Erlangen, Germany.
2. Department of Materials Science (Glass and Ceramics), University of Erlangen-Nuernberg, Erlangen, Germany.
3. Department of Internal Medicine 3—Rheumatology and Immunology, University Hospital Erlangen, Erlangen, Germany.
4. Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Nagoya, Japan.