- Correspondence to Dr María Luisa Caballero, Allergy Department, Hospital La Paz Institute for Health Research (IdiPAZ), Paseo de la Castellana 261, Madrid 28046, Spain;
- Received September 12, 2014
- Revised December 11, 2014
- Accepted January 10, 2015
- First published January 27, 2015.
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