Definition: In this task, you're given a paragraph from the research paper and your task is to generate a suitable title for the research paper based on the given paper. Under 100 words is a good title length.
Input: publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active. Cómo citar este artículo: Reina J, et al. Etiología viral de las exacerbaciones de los pacientes con enfermedad pulmonar obstructiva crónica en la época invernal. Med Clin (Barc). 2019. https://doi.

ARTICLE IN PRESS G Model