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Title
Positive benefits of theophylline in a randomized, double-blind, parallel-group, placebo-controlled study of low-dose, slow-release theophylline in the treatment of COPD for 1 year.
Authors
Yumin ZHOU; Xiaoping WANG; Xiangyi ZENG; Rong QIU; Junfeng XIE; Shengming LIU; Jingping ZHENG; Nanshan ZHONG; Pixin RAN