1. All of the authors are with the Faculty of Economics and Business, University of Groningen, Groningen, the Netherlands. Willem I. J. de Boer is also with the Institute of Sport and Exercise Studies, HAN University of Applied Sciences, Nijmegen, the Netherlands. Erik Buskens is also with the University Medical Center Groningen. Jochen O. Mierau is also with the Aletta Jacobs School of Public Health, University of Groningen.