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APA Citation
Halpin, D., Paggiaro, P., Bleecker, E., Engel, M., Moroni-Zentgraf, P., Schmidt, H., & Kerstjens, H. (n.d.). p255 Once-daily Tiotropium Respimat® Add-on To At Least Ics Maintenance Therapy Reduces Exacerbation Risk In Patients With Uncontrolled Symptomatic Asthma. Thorax, 69, A189. http://access.bl.uk/ark:/81055/vdc_100135154282.0x000028