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APA Citation
Crapo, J., Gupta, A., Lynch, D. A., Vogel-Claussen, J., Watz, H., Turner, A. M., Mroz, R. M., Janssens, W., Ludwig-Sengpiel, A., Beck, M., Langellier, B., Ittrich, C., Risse, F., & Diefenbach, C. (2021). fOOTPRINTS study protocol: rationale and methodology of a 3-year longitudinal observational study to phenotype patients with COPD. BMJ open, 11(3), . http://access.bl.uk/ark:/81055/vdc_100127580334.0x000059