1. School of Informatics and Computing; Indiana University; Bloomington IN USA
2. School of Information Management; Wuhan University; Wuhan Hubei China
3. University Library, Tongji University; Shanghai China
4. School of Information Management, Sun Yat-sen University; Guangzhou Guangdong China
5. Department of Information Management; Peking University; Beijing China
6. Center for the Study of Information Resources, Wuhan University; Wuhan Hubei China