- Correspondence to Dr Samuel Swisher-McClure, Department of Radiation Oncology, Perelman School of Medicine at the University of Pennsylvania, 3400 Civic Center Boulevard, TRC 2 West, Philadelphia, PA 19104, USA;
- Received December 12, 2014
- Revised April 17, 2015
- Accepted April 22, 2015
- First published May 14, 2015.
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