By Liliana Liverani and Aldo R.Boccaccini
Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
*Author to whom correspondence should be addressed.
Academic Editor: Ilaria Armentano
Received: 28 January 2016 / Accepted: 7 April 2016 / Published: 15 April 2016