PT  - JOURNAL ARTICLE
AU  - Laurits Frøssing
AU  - Morten Hvidtfeldt
AU  - Alexander Silberbrandt
AU  - Asger Sverrild
AU  - Celeste Porsbjerg
TI  - Missing sputum samples are common in asthma intervention studies and successful collection at follow-up is related to improvement in clinical outcomes
AID  - 10.1183/23120541.00612-2021
DP  - 2022 Jan 01
TA  - ERJ Open Research
PG  - 00612-2021
4099  - http://openres.ersjournals.com/content/early/2022/01/06/23120541.00612-2021.short
4100  - http://openres.ersjournals.com/content/early/2022/01/06/23120541.00612-2021.full