- Correspondence to Dr David Pérez-Callejo, Servicio de Oncología Médica, Hospital Universitario Puerta de Hierro-Majadahonda, Calle Manuel de Falla, Madrid 28222, Spain;
- Received February 7, 2017
- Revised May 10, 2017
- Accepted June 26, 2017
- First published August 4, 2017.
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