1. IREBS, University of Regensburg, Regensburg, Germany
2. Ecole hôtelìere de Lausanne, HES-SO, University of Applied Sciences and Arts Western Switzerland, Lausanne, Switzerland
3. The Kornblau Institute and Department of Finance, Insurance and Real Estate, School of Business, Virginia Commonwealth University, Richmond, VA, USA
4. ZEW Mannheim, Mannheim, Germany