1 Department of General Internal Medicine and Psychosomatics, University Hospital Heidelberg, Heidelberg University, Heidelberg, Germany.
2 Serra Hunter Program, Unit of Psychological Medicine, Department of Medicine, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain.
3 Institute of Cognitive Science, University of Colorado, Boulder, CO, United States.
4 The School of Public Health, University of Haifa, Haifa, Israel.