Complexity has retracted the article titled “Model-free adaptive sliding mode robust control with neural network estimator for the multi-degree-of-freedom robotic exoskeleton” [1] due to similarity identified with a previous publication [2].

Concerns were originally raised by the authors, who requested to replace the figures in the article to reduce the level of overlap. While the overlapping article was cited as reference 18 in the published article, it was not clear that the data were reused from this previous publication.

The article is therefore being retracted due to this overlap, with the agreement of the Chief Editor and the authors.