1 Service of Allergy and Clinical Immunology, Nuestra Señora de la Candelaria University Hospital, Santa Cruz de Tenerife, Spain. Electronic address: evperrod@gobiernodecanarias.org.
2 Service of Neurology, Multiple Sclerosis Unit, Nuestra Señora de la Candelaria University Hospital, Santa Cruz de Tenerife, Spain.
3 Service of Allergy and Clinical Immunology, Nuestra Señora de la Candelaria University Hospital, Santa Cruz de Tenerife, Spain.