1. FOOTPRINTS study protocol: rationale and methodology of a 3-year longitudinal observational study to phenotype patients with COPD. Issue 3 (22nd March 2021) Authors: Crapo, James; Gupta, Abhya; Lynch, David A; Vogel-Claussen, Jens; Watz, Henrik; Turner, Alice M; Mroz, Robert M; Janssens, Wim; Ludwig-Sengpiel, Andrea; Beck, Markus; Langellier, Bérengère; Ittrich, Carina; Risse, Frank; Diefenbach, Claudia Journal: BMJ open Issue: Volume 11:Issue 3(2021) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗