Expression of Concern: Nanodimensional and Nanocrystalline Apatites and Other Calcium Orthophosphates in Biomedical Engineering, Biology and Medicine. Materials 2009, 2, 1975-2045.

We wish to make readers aware that the text in the published paper [1] contains substantial overlap with a previous paper by the same author [2].[...].

We wish to make readers aware that the text in the published paper [1] contains substantial overlap with a previous paper by the same author [2]. Since [1] is an expanded version of [2] and the authorship is identical, we have taken the decision that it should remain in the literature. However, readers should be aware that the two papers are identical in many aspects. We regret that this issue was not detected prior to publication and apologize to readers of Materials for any inconvenience.