Waheed S, Khan MS, Qamar S, Shah SM, Rafiq E. Trend of Infectious Disease Positivity in Exchange and Voluntary Blood Donors at Regional Blood Centre, Karachi. Nat J Health Sci [Internet]. 2024 Sep. 24 [cited 2025 Jun. 22];9(3):204-8. Available from: https://ojs.njhsciences.com/index.php/njhs/article/view/627