Data Collectors Training: A five days training will be given for research assistants by the principal investigator. The training will mainly focus on the purpose of the study, data collection procedure, interview techniques, sampling methods, strict protection of confidentiality, ethical issues of VAW research and data quality assurance. Ethical sensitiveness of VAW will be explained to research assistants to maintain confidentiality and also quality of data. Brief explanation will be provided on biomedical research ethical principles and WHO (2001) gender based violence research ethical guideline recommendations called "women's safety first". Refreshment training and short orientation/debriefing will be provided regularly to research assistants during the study period.