PG	pyoderma gangrenosum
COVID-19	coronavirus disease 2019
mRNA	messenger ribonucleic acid
URTI	upper respiratory tract infection
MRI	magnetic resonance imaging
NPS	nasopharyngeal swab
RT-PCR	reverse transcription polymerase chain reaction
SARS-CoV-2	severe acute respiratory syndrome coronavirus 2
H&E	hematoxylin and eosin
RAND	research and development
UCLA	University of California at Los Angeles