All included patients were asked for written consent to be interviewed The Ethic Review Board of the Hospital Universitario Fundación Alcorcón Madrid, Spain, was asked for its favourable opinion in order to carry out the fieldwork.
Todos las personas incluidas en el estudio firmaron el consentimiento informado. El estudio obtuvo el dictamen favorable del Comité Ético de Investigación Clínica del Hospital Universitario Fundación Alcorcón.