Document is current

Any future updates will be listed below

Use of low-dose oral theophylline as an adjunct to inhaled corticosteroids in preventing exacerbations of chronic obstructive pulmonary disease: study protocol for a randomised controlled trial

Crossref DOI link: https://doi.org/10.1186/s13063-015-0782-2

Published Online: 2015-06-10

Published Print: 2015-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

About CrossMark