Rehman, Abdul, Huma Zeb, and Abid Ullah Khan Niazi. 2019. “Ultrasound Guidance Increases the Safety and Ease of Insertion of Central Venous Catheters in Patients Undergoing Elective Procedures”. Anaesthesia, Pain & Intensive Care, January, 474-77. https://apicareonline.com/index.php/APIC/article/view/285.