After publication of this study \[[@CR1]\], we realize that Dr. Sorin Boeriu was not listed among the authors. Please see the corrected author list below:

Adriana Monea†, Gabriela Beresescu \*†, Sorin Boeriu, Mezei Tibor, Sorin Popsor and Dragos Mihai Antonescu

The online version of the original article can be found under doi:10.1186/s12903-015-0122-7.
