RT Journal Article SR Electronic T1 The challenge of defining exacerbation in bronchiectasis JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1700700 DO 10.1183/13993003.00700-2017 VO 49 IS 6 A1 Miguel Ángel Martínez-García A1 Luis Máiz-Carro YR 2017 UL http://erj.ersjournals.com/content/49/6/1700700.abstract AB