Acknowledgements
This work was supported by CREDO Project - ID: 49182, financed by the National Authority of Scientific Research and Innovation, on behalf of the Romanian Ministry of European Funds- through the Sector Operational Program ”Increasing of Economic Competitiveness”, Priority Axis 2, Operation 2.2.1 (SOP IEC -A2-0.2.2.1-2013-1) co-financed by the European Regional Development Fund.
Author contribution : Conceptualization: AV; Methodology: SO; Data acquisition: AV, CG, VV, IP, AS, SD; Data analysis and interpretation: AV, DZ, AS-U, RV; Writing – original draft preparation: AV; Writing – review and editing: SO, RV, MD; Supervision: MD; Final approval of manuscript: all authors