A team of specially trained data collectors will be hired. Data will be collected on tablets using a data collection platform that has in-built checks of missing values, range checks, skip patterns etc. to minimize the error in data collection. A GPS monitoring of location of interview will be conducted. The data will be checked at an aggregate level for heaping, interviewer-specific patterns, etc. Forms identified with errors will be sent back for verification and re-entry, but audit-trail will be captured to ensure that the full trail from original data and changes will be maintained with timestamp, GPS and user information. On-site quality assurance would involve both real-time data checks as well as GPS verification of the location of data collection. Data access will be restricted by users, with different privileges for data collectors, supervisors and study investigators. All personal identification information including names, etc. will be encrypted, and only a unique identification number to identify individuals will be made available for analysis. Data will be hosted over a secured network.