Text and Data Mining valid from 2019-07-12
Received: 24 March 2018
Accepted: 10 June 2019
First Online: 12 July 2019
Compliance with ethical standards
: Authors declare that they have no conflict of interest.
: This study was approved by Mashhad University of Medical Sciences. The permission was obtained from the Ethics Committee with No. ExternalRef removed.REC1395.312. All procedures performed in the study were in accordance with the 1964 Helsinki declaration and its later amendments.
: All physicians and staff of clinics participated voluntarily and were verbally informed about their privacy.