AM	alveolar macrophages
AP	alkaline phosphatase
ARDS	acute respiratory distress syndrome
BAL	bronchoalveolar lavage
CC	cell count
COVID-19	coronavirus disease 2019
CP1	cyclophosphamide and prednisolone regimen 1
CP2	cyclophosphamide and prednisolone regimen 2
CP3	cyclophosphamide and prednisolone regimen 3
CP4	cyclophosphamide and prednisolone regimen 4
CP5	cyclophosphamide and prednisolone regimen 5
CP6	cyclophosphamide and prednisolone regimen 6
CT	computer tomography
ECMO	extracorporeal membrane oxygenation
EG	eosinophile granulocytes
GGT	γ-glutamyltransferase
HFNC	high-flow nasal cannula
ICU	intensive care unit
IL-6	interleukin 6
ILD	interstitial lung disease
LYM	lymphocytes
MIV	mechanical invasive ventilation
MRI	magnetic resonance imaging
NG	neutrophile granulocytes
NIV	non-invasive ventilation
P/F	pO2/FiO2
p-ANCA	perinuclear anti-neutrophil cytoplasmic antibody positive
PCR	polymerase chain reaction
PEEP	positive end-expiratory pressure
SARS-CoV-2	severe acute respiratory syndrome coronavirus type 2
vv-ECMO	venovenous extracorporeal membrane oxygenation