Classification of chronic pain for the International Classification of Diseases (ICD-11): results of the 2017 international World Health Organization field testing.

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"The collection of the German part of the data was supported by a grant from the German Federal Ministry of Health (grant number: D105–01_07_ICD-11_TMF_UM). The authors acknowledge the help of the International Association for the Study of Pain (IASP) Task Force for the Classification of Chronic Pain for the ICD-11 with the development of the case vignettes and thank Matthew D'Uva (IASP) for providing the training environment on the IASP webpage, Ulrich Vogel (DIMDI) for advice on integrating the specialty field testing into the WHO field testing, and the WHO for providing the link to WHO-FiT, Nora Idris for her help in administrating the WHO-FiT, and Ginea Hay for her help with analyzing the ICD-10 codes. A. Barke's position was funded by a grant from the International Association for the Study of Pain to Marburg University. The IASP did not play a role in study design, data collection, analysis and interpretation of the data, or writing the manuscript. R.-D. Treede reports grants from European Union IMI; grants from TEVA; personal fees from Bayer, Grünenthal, GSK, and Sanofi; and grants from Deutsche Forschungsgemeinschaft, outside the submitted work. The remaining authors have no conflicts of interest to declare."