1. Department of Law, Economics Division, University of Salento, Via per Monteroni snc, Lecce 73100, Italy. e-mail: nicola.deliso@unisalento.it
2. Department of Science and Technology, University of Sannio, via Francesco de Sanctis snc, Benevento 82100, Italy. e-mail: filatrella@unisannio.it
3. Manchester Institute of Innovation Research, University of Manchester, Oxford Road, Manchester M13 9PL, UK. e-mail: Dimitri.Gagliardi@manchester.ac.uk
4. Department of Physics, University of Salerno, Via Giovanni Paolo II, Fisciano, SA 84084, Italy. e-mail: cnapoli@unisa.it