1. Institute of Materials Physics and Engineering, Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy
2. Northeastern Laboratory for Evaluation and Development of Biomaterial (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, State College, PA 16801, USA