| IT | Milano | Politecnico di Milano | Politecnico di Milano | 
        
            | PL | Warsaw | Polish Economic Institute | Polski Instytut Ekonomiczny | 
        
            | LT | Kaunas | Policy Impact Lab | MB Politikos tyrimų laboratorija | 
        
            | IT | Prato | PIN Foundation – Prato Hub of the University of Florence (former PIN S.c.r.l. Educational and Scientific services for the University of Florence) | Fondazione PIN – Polo di Prato dell’Università di Firenze (former PIN S.c.r.l. Servizi didattici e scientifici per l’Università di Firenze) | 
        
            | DE | Marburg | Philipps-Universitaet Marburg | Philipps-Universitaet Marburg | 
        
            | US | Washington | Pew Research Center | Pew Research Center | 
        
            | US | Washington | Peterson Institute for International Economics | Peterson Institute for International Economics | 
        
            | HU | Budapest | Periféria Policy and Research Center | Periféria Közpolitikai és Kutatóközpont Kft. | 
        
            | US | Pennsylvania | Pennsylvania State University, Department of Economics | Pennsylvania State University, Department of Economics | 
        
            | CN | Shenzhen | Peking University HSBC Business School | Peking University HSBC Business School |