%0 Journal Article %A Dirk van Lier %A Matthijs Kox %A Karine Santos %A Hans van der Hoeven %A Janesh Pillay %A Peter Pickkers %T Increased blood angiotensin converting enzyme 2 activity in critically ill COVID-19 patients %D 2021 %R 10.1183/23120541.00848-2020 %J ERJ Open Research %P 00848-2020 %V 7 %N 1 %U https://openres.ersjournals.com/content/erjor/7/1/00848-2020.full.pdf