Author_response_to_reviewers – Supplemental material for The efficacy of adding budesonide/formoterol to ipratropium plus theophylline in managing severe chronic obstructive pulmonary disease: an open-label, randomized study in China

Supplemental material, Author_response_to_reviewers for The efficacy of adding budesonide/formoterol to ipratropium plus theophylline in managing severe chronic obstructive pulmonary disease: an open-label, randomized study in China by Kewu Huang, Yanfei Guo, Jian Kang, Li An, Zeguang Zheng, Lijun Ma, Liping Peng, Hongyang Wang, Rong Su, Yohji Itoh and Chen Wang in Therapeutic Advances in Respiratory Disease