The second technique involves finding any yet unmentioned elements from
the resource examine.com for COPD.
Lastly, we perform a search in clinicaltrails.gov with outcome measure
“FEV1” OR “FVC” OR “FEV1/FVC”. The unique interventions are
extracted. For each unique element, we perform a literature search for
meta-analyses evaluating that particular intervention for its effect on
the outcome measures FEV1, FVC or FEV1/FVC.
The third technique is finding the interventions on the examine.com page for COPD and recording these studies.