Study Design and Participants
somatic deterioration
RECRUITMENT
The study was designed as a randomized, controlled, clinical study with a single-blinded waitlist and parallel group paradigm. The RCT was registered at the German Clinical Trials Registry (ID: DRKS00015773) and approved by the Ethics Committee of the Medical Faculty of the University of Duisburg-Essen (No.: 18-8079-BO dated 18.10.2018). Recruitment took place in the Completers were defined a priori as patients who completed 6 or more of the 10 intervention sessions. None of the patients was non-completers. However, one patient dropped out of the study after the sixth NF session due to somatic deterioration. This patient’s data could not be included in the analyses.