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We introduce a gravity model to the currency choice for cross‐border trade settlement and the Heckman selection model to estimate the impact of the exchange rate on the cross‐border trade settlement of the Renminbi (RMB). We analyse bilateral exchange rates using panel data of China and 182 RMB settlement countries, or areas, from 2009 to 2014. We find that, regardless the choice stage or scale stage of RMB cross‐border trade settlement, the appreciation of the RMB does not necessarily promote RMB cross‐border trade settlement. This result holds when we take geographic differences into account and split the settlement of cross‐border trade into merchandise and service trade. We further investigate the channels through which exchange rate influences the cross‐border trade settlement of RMB, and we find that the appreciation of RMB impedes enterprises from choosing RMB as their settlement currency by reducing the scale of export to RMB settlement areas, whereas it speeds up RMB cross‐border trade settlement by increasing the scale of China's import from RMB settlement areas. We find that China's economic strength supports the development of RMB cross‐border trade settlement. However, the geographical distance between China and the RMB settlement areas may inhibit cross‐border trade settlement in RMB.

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Objective. The purpose of the systematic review is to verify the effect of biofeedback therapy on limb motor rehabilitation in patients with acute stroke and to provide evidence-based medicine for the promotion and use of biofeedback therapy. Methods. The randomized controlled trials (RCT) of biofeedback therapy in the treatment of cerebral palsy were searched in PubMed, EMBASE, ScienceDirect, Cochrane Library, China National Knowledge Infrastructure (CNKI), China VIP Database, Wanfang Database, and Chinese Biomedical Literature Database (CBM). The starting time and ending time of this study are from the time of building the database of the number of pieces to October 31, 2018. The data included in this study were extracted by two independent researchers and evaluated the bias risk of all the literature included in the study according to the Cochrane manual 5.1.0 criteria. RevMan5.4 statistical software was used to analyze the collected data by meta. Results. This systematic review included 9 RCT studies with a total of 1410 patients. The results of meta-analysis showed that there were significant differences in the improvement of lower limb muscle tension, comprehensive spasm scale score, EMG score, and passive range of motion of ankle joint between biofeedback therapy and routine rehabilitation therapy. Conclusion. Biofeedback therapy can improve lower limb muscle tension, spasticity, EMG integral value, and passive range of motion of ankle joint in children with cerebral palsy and provide better conditions for improving the motor ability of lower extremities in children with cerebral palsy. However, more studies and follow-up with higher methodological quality and longer intervention time are needed to further verify.

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