1. Business Systems and Analytics Department, Distinguished Chair of Business Analytics; La Salle University; Philadelphia PA 19141
2. Business Information Systems Department, Faculty of Business Administration and Economics; University of Paderborn; D-33098 Paderborn Germany
3. Department of Mathematics and Statistics; York University; Toronto M3J 1P3 Canada
4. Departamento de Economía Aplicada II, Facultad de Económicas; Universidad Complutense de Madrid; Campus de Somosaguas 28223 Pozuelo Spain