RT Journal Article SR Electronic T1 Ultrasound Guidance for Central Venous Catheter Insertion JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 608 OP 609 DO 10.1136/emj.2004.015156 VO 22 IS 8 A1 M Chikungwa A1 M Lim YR 2005 UL http://emj.bmj.com/content/22/8/608.3.abstract AB