Competing interests
The authors declare that they have no competing interests. The authors have no conflict of interest associated with this publication.
Authors’ contributions
Dr. II was responsible for collection of all retrospective and follow-up data and for organizing the data base. Dr. S conceived the study, contributed to design the study, recorded baseline data and contributed to draft the manuscript. Dr. LB recorded baseline data and contributed for organizing the data base and to draft the manuscript. Dr. M recorded baseline data, contributed to design the study and to draft the manuscript. Dr. R performed the statistical analysis and contributed to the interpretation of the data. Dr. I conceived the study, contributed to the study design, recorded baseline data and drafted the manuscript. All authors actively discussed the subject, revised the paper, and provided final approval.