Ethics approval and consent to participate
The protocol of study was approved ethics committee of Shahid Sadoughi Yazd University of Medical Sciences (IR.SSU.SPH.REC.1394.89 and IRCT number: IRCT2016021126519N1 2016-06-04). A written informed consent was obtained from all participants. In the case of illiterate women, it was completed by their husbands. All participants were above 16 years of age and none of the participants refused to take part in the study. The study was performed in accordance with the Declaration of Helsinki.