Impaired pain-related threat and safety learning in patients with chronic back pain.

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"The authors thank Jaspreet Kaur, Vanessa Dobischat, and Ashtar Hashim for their help in recruiting participants and data acquisition, Harald Engler and Alexandra Kornowski for analyzing saliva samples, and Diana Müßgens for editing the manuscript. Author J. Kleine-Borgmann was supported as a Clinician Scientist within the University Medicine Essen Academy (UMEA) program, funded by the German Research Foundation (DFG; grant FU356/12-1) and the Faculty of Medicine, University of Duisburg-Essen. This work was supported by a grant from the German Research Foundation (DFG; project number 316803389–SFB 1280 given to U.B., K.F., S.E., C.J.M., and O.T.W.)."