1. Department of Management; King's College London; 150 Stamford Street London SE1 9NH UK
2. Dpto de Análisis Económico: Economía Cuantitativa; Universidad Autónoma de Madrid; Calle Francisco Tomás y Valiente 5 28049 Madrid Spain
3. Département des relations industrielles; Pavillon J.A. DeSève, Université Laval; Québec Canada G1V 0A6
4. Queen's University Management School; Queen's University; Belfast Northern Ireland