Text and Data Mining valid from 2019-09-13
Received: 16 May 2019
Accepted: 7 July 2019
First Online: 13 September 2019
Change Date: 26 November 2019
Change Type: Correction
Change Details: After publication of the Original research article  it was brought to our attention that the sentence at the bottom of the section entitled Discussion (pag 6 of 9, just below Fig. 4) must be corrected as follows:
Ethics approval and consent to participate
: The study was approved by the Ethical and Scientific Commission of the National Centre for Respiratory Pharmacoeconomics and Pharmacoepidemiology during the session of January 4th, 2016 (# RD 011/G01/16). All participants have given their consent.
: Only data collected from patients who gave their informed consent to the investigation and to the possible use of information for scientific purposes were used for the present study.
: The authors declare no conflict of interest. RWD is Associate Editor of <i>Multidisciplinary Respiratory Medicine.</i>