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APA Citation
Vogelberg, C., Moroni-Zentgraf, P., Leonaviciute-Klimantaviciene, M., Sigmund, R., Hamelmann, E., Engel, M., & Szefler, S. (2015). a randomised dose-ranging study of tiotropium Respimat® in children with symptomatic asthma despite inhaled corticosteroids. Respiratory research, 16(1), 1–10. http://access.bl.uk/ark:/81055/vdc_100080567082.0x000069