Tiotropium as an add-on treatment to inhaled corticosteroids in children with severe and mild symptomatic asthma: Multi-center observational study for efficacy and safety analysis

噻托溴铵作为吸入性糖皮质激素的辅助治疗，用于治疗重度及轻度症状性哮喘患儿：一项多中心观察性研究，旨在评估其疗效和安全性。