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APA Citation
Kapoor, A. S., Olsen, S., O'Hara, C., Puttagunta, L., & Vethanayagam, D. (2009). the Efficacy of Tiotropium as a Steroid-Sparing Agent in Severe Asthma. Canadian respiratory journal, 16(3), 99–101. http://access.bl.uk/ark:/81055/vdc_100173105277.0x00002d