Data collection and data quality assurance
Data were collected using respondent administered questionnaire. A questionnaire consisted of 60 variables, which was categorized into three parts. This includes Socio—demographic, personal characteristics and other exposure variables. Each variable had list of responses to be responded only by the participant. To assure the data quality, 2 days training was given to four data collectors and two supervisors. Appropriate information and instruction on the objective and relevance of the study was given to the respondents. The data collectors were stayed with respondents until all questions filled and responded. Informed consent was also secured to the respondents.