Ethical Considerations

Ethical clearance was obtained from the institutional review board. The objective of the study was clearly described to the study participants including the benefits and risk, and confidentiality was maintained using identification codes. Considering the objective of the study and the demographic characteristics of the participants, the institutional review board gave a permission to take both verbal or written consent. So both verbal or written informed consents were taken from respondents prior to enrollment and collection of data. Verbal consent was taken from some respondents who are not able to read and write, and written consent was taken from those who can put their signature, and conducted in accordance with the Declaration of Helsinki.