Acknowledgements
The authors thank all the patients for their willingness to participate in this research study. Further, we acknowledge C. Papanakos for statistical analysis and K. Stavropoulou, M. Margariti, D. Pantelia, P. Diamantopoulou for excellent technical assistance.
Potential conflict of interest
Disclosure forms provided by the authors are available with the full text of this article online at http://dx.doi.org/10.1080/10428194.2017.1295148.