Data quality was assured by designing proper data extraction tools. The adopted data extraction tools were evaluated by experienced researchers. A pretest was done on 5% of the sample size with a structured checklist at FHCSH before starting the actual study period and necessary corrections were done. After the pretest, unrecorded variables were reduced from the data extraction tools and others were arranged as per medical records. Training was provided for data collectors and supervisor before data collection and there was close follow up of data collectors by supervisor and the principal investigator. The collected data were checked out for completeness, accuracy and clarity by the principal investigator and supervisor.

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