Text and Data Mining valid from 2019-03-18
Received: 11 June 2018
Revised: 22 December 2018
Accepted: 12 February 2019
First Online: 18 March 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Mehrdad Bakhshayeshkaram.
: The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
: No complex statistical methods were necessary for this paper.
: Written informed consent was not required for this study because the Review Board of Shahid Beheshti University of Medical Sciences waived the need for an informed consent.
: Institutional Review Board of Shahid Beheshti University of Medical Sciences approval was obtained.
: • Retrospective• Observational• Performed at one institution