- Correspondence to Dr David T Levy, Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, 3300 Whitehaven St, NW, Suite 4100, Washington, DC 20007, USA;
- Received 19 March 2017
- Revised 11 July 2017
- Accepted 5 August 2017
- Published online 18 December 2017.
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