1 Department of Medical and Health Sciences, Linköping University, Linköping, Sweden.
2 Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden.
3 Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.
4 Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, University of DuisburgEssen, Essen, Germany.
5 G. Oppenheimer Center for Neurobiology of Stress and Resilience, Vatche and Tamar Manoukian Division of Digestive Diseases, David Geffen School of Medicine at UCLA, USA.