FOOTPRINTS study protocol: rationale and methodology of a 3-year longitudinal observational study to phenotype patients with COPD.

James D CrapoAbhya GuptaDavid A LynchJens Vogel-ClaussenHenrik WatzAlice M TurnerRobert M MrozWim JanssensAndrea Ludwig-SengpielMarkus BeckBérengère LangellierCarina IttrichFrank RisseClaudia Diefenbach

Published in: BMJ open (2021)

NCT02719184.

Keyphrases

study protocol
chronic obstructive pulmonary disease
clinical trial
randomized controlled trial
lung function
cross sectional
open label
double blind
air pollution