Expression of concern
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The Editor-in-Chief wishes to issue an expression of concern for this article  following an investigation by Ghent University. The investigation, conducted by the university’s committee for scientific integrity, concluded that although there was no direct evidence of data fabrication, the research and the findings as described in this article cannot be verified. The findings of the committee have been confirmed by the Flemish Committee for Scientific Integrity, a body of the Royal Flemish Academy of Belgium for Science and the Arts. Author Roeland J.G. De Moor disagrees with this notice. Author Geert Hommez agrees with this notice. The other authors have not responded to correspondence about this notice.
- 1.De Moor RJG, Stassen IG, van’t Veldt Y, Torbeyns D, GMG H (2011) Two-year clinical performance of glass ionomer and resin composite restorations in xerostomic head- and neck-irradiated cancer patients. Clin Oral Investig 15:31–38. https://doi.org/10.1007/s00784-009-0355-4 CrossRefPubMedGoogle Scholar