Goyal M, Sharma R, Gupta D K, Sharma A, Berry M
Department of Radiodiagnosis, All India Institute of Medical Sciences, New Delhi, India.
J Clin Ultrasound. 1996 Nov-Dec;24(9):543-4. doi: 10.1002/(SICI)1097-0096(199611/12)24:9<543::AID-JCU11>3.0.CO;2-7.