Text and Data Mining valid from 2020-03-20
Received: 7 January 2019
Accepted: 25 February 2020
First Online: 20 March 2020
Ethics approval and consent to participate
: Written informed consent was obtained from participations and verbal consent from illiterate participants following a detailed explanation of the study objectives. The study was conducted in accordance with the ethical principles and its protocol was approved by the Ethics Committee of Guilan University of Medical Sciences (ethical code: IR.GUMS.REC.1396.8).
: Not applicable.
: The authors declare that they have no competing interests.