Comparison of tiotropium inhalation capsules and ipratropium metered dose inhaler in a randomized, double-blind, double-dummy, efficacy and safety study in patients with chronic obstructive pulmonary disease

• 吸入噻托溴铵干粉与异丙托溴铵定量气雾剂治疗慢性阻塞性肺疾病的疗效与安全性比较