1. Center for Studies of Information Resources, School of Information Management, Wuhan University , 299 Bayi Road, Wuhan 430072, China
2. Centre for R&D Monitoring (ECOOM) and Department of MSI, KU Leuven , Oude Markt 13, Leuven 3000, Belgium
3. School of Information Technology, Shangqiu Normal University , 298 Wenhua Road, Shangqiu 476000, China
4. Institute for Statistical Studies and Economics of Knowledge (ISSEK), National Research University Higher School of Economics , 11 Myasnitskaya Street, Moscow 101000, Russian Federation