Expression of concern: “GBERT: A hybrid deep learning model based on GPT-BERT for fake news detection” [Heliyon 10 (2024) e35865]

An investigation conducted on behalf of the journal by Elsevier's Research Integrity & Publishing Ethics team found a significant increase of citations to papers published by the authors, Pummy Dhiman, Amandeep Kaur, and Ghulam Muhammad between the original submission and the revised version of this article. In summary, one paper by the authors was cited in the original version of the article. This increased to six papers in the revised version of the article. The authors were also requested by one of the reviewers to insert references to their papers during the peer-review process.