Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleEffects of Tiotropium Combined with Theophylline on Stable COPD Patients of Group B, D and its Impact on Small Airway Function: A Randomized Controlled Trial.AuthorsXiong, Xiao-feng; Fan, Li-li; Wu, Hong-xia; Zhu, Min; Cheng, De-yunPublicationAdvances in Therapy, 2018, Vol 35, Issue 12, p2201ISSN0741-238XPublication typejournal articleDOI10.1007/s12325-018-0831-9