Doubilet Peter M, Benson Carol B, Bourne Tom, Blaivas Michael
*Brigham and Women's Hospital and Harvard Medical School; †Queen Charlotte's and Chelsea Hospital, Imperial College, London, UK; and ‡University of South Carolina.
Ultrasound Q. 2014 Mar;30(1):3-9. doi: 10.1097/RUQ.0000000000000060.