Ethics approval and consent to participate
The research project was confirmed by the Ethics Committee of Iran University of Medical Sciences, Tehran, Iran, with the ethics code of IR.IUMS.REC.1399.1106. After obtaining a sampling license from the Iran University of Medical Sciences. The participants were asked to sign a written informed consent. Respondents were completely informed of the study’s purpose and procedures. Besides, they were assured of the confidentiality of information. All methods were performed in accordance with the relevant guidelines and regulations.