Ethic approval and consent to participate
The Ethics Committee of Iran University of Medical Sciences, Tehran, Iran (IR.IUMS.REC1396.9513373007) approved the study. All women read and signed the informed consent prior to participating in the study, and their information was kept confidential. Women were reassured that their names would not be included in reporting the present study. In this study, no additional costs were imposed on any mothers and no additional treatment costs were considered.