CXR	chest X-rays
CT	computed tomography
ML	machine learning
AI	artificial intelligence
DL	deep learning
RT-PCR	reverse transcription polymerase
HU	Hounsfield unit
AUC	the area under curve
ROC	the receiver operating character
CAP	community-acquired pneumonia
LR	logistic regression
RF	random forest
SVR	support vector regression
GGO	ground glass opacity