Jang Timothy B, Coates Wendy C, Liu Yiju T
Harbor-UCLA Medical Center, David Geffen School of Medicine at UCLA, Los Angeles Biomedical Institute at Harbor-UCLA, 1000 W Carson Ave, D-9A, Torrance, CA 90502, USA.
J Ultrasound Med. 2012 Apr;31(4):515-21. doi: 10.7863/jum.2012.31.4.515.