2[1]Armstrong PJ, Cullen M, Scott DHT. The"Site Rite"ultrasound machine-an aid to internal jugular vein cannulation. Anaesthesis. 1993,48:319-323.
3[3]Mark SS, David BK, David LL. An anteromedial internal jugular vein successfully cannulated using the assistance of ultrasonography. Journal of Clinical Anesthesia, 2000, 12: 83-86
4[4]Denys BG, Uretsky BF. Anatomical variations If internal jugular vein location: impact on central venous access. Critical Care Medicine. 1991, 19:1516-1519
