ACE2	Angiotensin-converting enzyme 2
ANS	Autonomic nervous system
ARDS	Acute respiratory distress syndrome
BBB	Blood–brain barrier
BDI	Beck Depression Inventory
C-19	COVID-19
CBC	Complete blood count
CBT	Cognitive behavioral therapy
CBT-I	Cognitive behavioral therapy for insomnia
CFS	Chronic fatigue syndrome
CFQ	Cognitive Failures Questionnaire
CIRCI	Critical illness-related corticosteroid insufficiency
CNS	Central nervous system
CoQ10	Coenzyme Q10
DHA	Docosahexaenoic acid
EAS	Extended autonomic system
EEG	Electroencephalogram
EMDR	Eye movement desensitization and reprocessing
EPA	Eicosapentaenoic acid
FIASMA	Inhibition of acid sphingomyelinase
GAD	Generalized anxiety disorder
GAD-7	Generalized Anxiety Disorder-7
HADS	Hospital Anxiety and Depression Scale
HPA	Hypothalamic–pituitary–adrenal
HRQoL	Health-related quality of life
QoL	quality of life
ICU	Intensive care unit
IL	Interleukins
L-C19	Long COVID-19
MBCT	Mindfulness-based cognitive therapy
MBSR	Mindfulness-based stress reduction
MCI	Mild cognitive impairment
MDD	Major depressive disorder
MMSE	Mini-Mental State Examination
MoCA	Montreal Cognitive Assessment
MRI	Magnetic resonance imaging
NAC	N-acetylcysteine
OCD	Obsessive–compulsive disorder
PASC	Post-acute sequelae of SARS-CoV-2 infection
PCL-5	PTSD Checklist for DSM-5
PEM	Post-exertional malaise
PHQ-9	Patient Health Questionnaire
POTS	Postural orthostatic tachycardia syndrome
PTSD	Post-traumatic stress disorder
PSQI	Pittsburgh Sleep Quality Index
SSRI	Selective serotonin reuptake inhibitor
TSH	Thyroid-Stimulating Hormone
T4	Thyroxine