- Correspondence to Dr Leticia Leon, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IDISSC), Hospital Clínico San Carlos, Martin Lagos s/n, Madrid 28040, Spain;
- Received June 23, 2016
- Revised October 11, 2016
- Accepted October 16, 2016
- First published November 1, 2016.
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