Study realised by Konstantin Braüer (Goethe University, Frankfurt), Andreas Hackethal (Goethe University, Frankfurt), Sebastian Scheurle (McKinsey & Company, Inc & Goethe University, Frankfurt)
Study realised by Wolfram J. Horneff (Goethe University), Raimond H. Maurer (Goethe University), Olivia S. Mitchell (The Wharton School
University of Pennsylvania), and Michael Z. Stamos (Goethe University)