Author contributions
RECRUITMENT
B. P. P. 
Information: MD, Ph.D., Central Institute of Mental Health, Mannheim, Germany. 
E-Mail: Bruno.PedrazPetrozzi@zi-mannheim.de 
Contributions: B. P. P. wrote the introduction, performed the data analysis, contributed to the methods section, wrote the discussion section, and worked on all other parts of the manuscript preparation, including proofreading.
H.S. 
Information: MD, Central Institute of Mental Health, Mannheim, Germany. 
E-Mail: Helena.sardinha@zi-mannheim.de 
Contributions: HS performed in the data collection, supervised the methods section of the manuscript, and was involved in preparing the discussion section and in proofreading of the manuscript.
M. G.
Information: MD, Medical Faculty Mannheim and Central Institute of Mental Health, Mannheim, Germany; research Co-group leader of the working group “Stress”.
E-Mail: Maria.gilles@zi-mannheim.de 
Contributions: M. G. contributed to the organization of the study, with the participants’ recruitment and the methods, particularly with questions about the biological properties of salivary cortisol and an adequate statistical analysis. She participated in the preparation of the discussion section and in proofreading of the manuscript.
M. D.
Information: apl. Professor, MD, Medical Faculty Mannheim; Vice-chair of the Central Institute of Mental Health - Mannheim. Research group leader of the working group “Stress”. 
E-Mail: Michael.deuschle@zi-mannheim.de 
Contribution: M. D. developed the idea for the study, supervised the data collection, the methods and the analyses, and worked on proofreading of the manuscript.