1. AT&T Professor, Marketing, Case Western Reserve University, 10900 Euclid Ave, Cleveland, OH 44106, USA;
2. Marketing, Oklahoma State University, Stillwater, OK, USA;
3. University of Nebraska-Lincoln, Robert D. Hays Distinguished Chair of Sales Excellence, 1400 R St, Lincoln, NE 68588, USA;
4. J.J. Vanier Distinguished Chair of Relational Selling and Marketing, Kansas State University, Manhattan, KS 66506, USA;
5. Marketing, ESMT Berlin, Schloßpl. 1, Berlin, 10178, Germany;
6. Marketing, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK;
7. Marketing, University of St. Thomas, 2115 Summit Ave, St. Paul, MN 55105, USA;
8. Marketing Clemson University, Clemson, SC 29634, USA;
9. Marketing Babson College, 231 Forest St, Babson Park, MA 02457, USA