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1“... and theoretical sampling. Data were generated by unstructured interviews and participant observations. Constant...”
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2“.... Thirty- eight participants were recruited by purposeful and theoretical sampling and data were generated...”
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3“.... Materials and method: This study had a descriptive design. The sample comprised 200 addicts who all were...”
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4“.... The data collected by semi-structured interviews and participants’ observation, from a purposive sample...”
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