Abbreviations ACE: Angiotensin-converting enzyme AMAG: Autoimmune metaplastic atrophic gastritis ANA: Antinuclear antibody CBC: Complete blood count CFS: Chronic fatigue syndrome CH50: Total complement activity CIS: Clinically isolated syndrome CSF: Cerebrospinal fluid CT: Computed tomography dsDNA: Double-stranded DNA ENA: Extractable nuclear antigen EMAG: Environmental metaplastic atrophic gastritis FLAIR: Fluid-attenuated inversion recovery HCV: Hepatitis C virus HIV/AIDS: Human immunodeficiency virus/acquired immunodeficiency syndrome IIF: Indirect immunofluorescence IV: Intravenous MCHC: Mean corpuscular hemoglobin concentration MCV: Mean corpuscular volume MDD: Major depressive disorder MMA: Methylmalonic acid MMSE: Mini-mental state examination MOG: Myelin oligodendrocyte glycoprotein MRI: Magnetic resonance imaging MRV: Magnetic resonance venography MS: Multiple sclerosis NMO: Neuromyelitis optica OCT: Optical coherence tomography PA: Pernicious anemia PCR: Polymerase chain reaction SCD: Subacute combined degeneration SLE: Systemic lupus erythematosus SNRI: Serotoninnorepinephrine reuptake inhibitor SS-A/Ro: Sjgrens syndrome antibody A SS-B/La: Sjgrens syndrome antibody B TPO: Thyroid peroxidase TSH: Thyroid-stimulating hormone UBOs: Unidentified bright objects References Mohamed M, Thio J, Thomas RS, Phillips J

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