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Zainudin MHH, Abdullah KA. Petroleum Jelly as an Alternative Coupling Agent to Reduce Umbrella Artifacts in Ultrasound Superficial Scans. Malays J Med Health Sci [Internet]. 2025 Jul. 31 [cited 2026 May 10];21(4):138-43. Available from: http://mjmhsojs.upm.edu.my/index.php/mjmhs/article/view/1273