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Dr. Zahid Khan, Asadullah, Arshad Ali. Anemia and its Causes among Children in District Dir Lower Applying Ranked Set Sampling Method for Data Collection. RJSSER [Internet]. 2022Nov.22 [cited 2026Aug.31];3(4):34-7. Available from: https://www.rjsser.org.pk/ojs/index.php/rjsser/article/view/543