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APA Citation

    van Grunsven, P. M., van Schayck, C. P., Derenne, J. P., Kerstjens, H. A. M., Renkema, T. E. J., Postma, D. S., Similowski, T., Akkermans, R. P., Jong, P. C. M. P., Dekhuijzen, P. N. R., van Herwaarden, C. L. A., & van Weel, C. (1999). long term effects of inhaled corticosteroids in chronic obstructive pulmonary disease: a meta-analysis. Thorax, 54(1), 7–14. http://access.bl.uk/ark:/81055/vdc_100135129713.0x000027
  
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