| Original language | English |
|---|---|
| Article number | e040630 |
| Journal | BMJ Open |
| Volume | 2021 |
| Issue number | 11 |
| Early online date | 2 Jun 2021 |
| DOIs | |
| Publication status | Published - 2 Jun 2021 |
Funding
Funding This work was supported by the Medical Research Council (grant number MR/P008933/1) of the UK under the Global Alliance for Chronic Lung diseases program. Competing interests None declared. Patient consent for publication Not required.