- Correspondence to Dr Robert Darflinger, Department of Radiology, Kaiser Permanente Los Angeles Medical Center, 1505-B N. Edgemont St., Kaiser Permanente, Los Angeles, CA 90027, USA;
- Received January 23, 2015
- Revised April 1, 2015
- Accepted April 6, 2015
- First published April 28, 2015.
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