1. Computer Science Department, Johns Hopkins University, USA and Language Technologies Institute, Carnegie Mellon University, USA
2. Heinz College of Information Systems and Public Policy and Machine Learning Department, Carnegie Mellon University, USA
3. Microsoft Research NYC, USA and Heinz College of Information Systems and Public Policy, Carnegie Mellon University, USA
4. School of Social Work, University of North Carolina at Chapel Hill, USA
5. Heinz College of Information Systems and Public Policy, Carnegie Mellon University, USA
6. Paul G. Allen School of Computer Science & Engineering, University of Washington, USA