1. Center for Research and Applications of Nonlinear Systems; Department of Mathematics; University of Patras; Patras Greece
2. Technological Educational Institute of Epirus Department of Accounting and Finance; Preveza Greece
3. Computer Systems Laboratory; Department of Electrical and Computer Engineering; University of Patras; Patras Greece
4. Laboratory of Nonlinear Systems and Applied Analysis; Department of Mathematics; University of Patras; Patras Greece
5. Department of Periodontology; Academic Center for Dentistry Amsterdam (ACTA); University of Amsterdam and VU University; Amsterdam The Netherlands