Tengvall Sara, Ohlsson Claes, Bygdell Maria, Martikainen Jari, Andersson Anders, Kindblom Jenny M
Närhälsan, Frölunda Vårdcentral, Gothenburg, Sweden.
These authors contributed equally.
ERJ Open Res. 2020 Mar 2;6(1). doi: 10.1183/23120541.00326-2019. eCollection 2020 Jan.