1. LinkedIn Corporation, 700 E Middlefield Rd, Mountain View, CA 94043, USA.
2. Harvard Business School, Soldiers Field, Boston, MA 02163, USA.
3. Stanford University, 353 Jane Stanford Way, Stanford, CA 94305, USA.
4. National Bureau of Economic Research, 1050 Massachusetts Ave., Cambridge, MA 02138, USA.
5. Massachusetts Institute of Technology, MIT Sloan School of Management, 100 Main St., Cambridge, MA 02142, USA.