1. Department of Psychosomatic Medicine and Psychotherapy, University Hospital of Essen, Essen, Germany
2. Department of Psychosomatic Medicine and Psychotherapy, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), University Hospital of Erlangen, Germany
3. MVZ Labor Dessau GmbH, Dessau-Roßlau, Germany
4. Department of Laboratory Medicine, Karolinska Institutet and Karolinska University Laboratory, Stockholm, Sweden