1. Department of Sociology, University of Houston, Houston, Texas, USA
2. RGK Center for Philanthropy and Community Service, LBJ School of Public Affairs, University of Texas at Austin, Austin, Texas, USA
3. Center for Nonprofit and Philanthropy, Bush School of Government and Public Service, Texas A&M University, College Station, Texas, USA
4. Institute for Science, Technology and Public Policy, Bush School of Government and Public Service Texas A&M University, College Station, Texas, USA