9/11	11 September 2001
WTC	World Trade Center
PTSD	Posttraumatic Stress Disorder
EBT	Evidence-Based Treatment
PE	Prolonged Exposure
CPT	Cognitive Processing Therapy
EMDR	Eye Movement Desensitization and Reprocessing
FDNY	Fire Department of New York
VNS	Vagus Nerve Stimulation
taVNS	Transcutaneous Auricular Vagus Nerve Stimulation
tcVNS	Transcutaneous Cervical Vagus Nerve Stimulation
CAPS-5	Clinician-Administered PTSD Scale for DSM-5
PCL-5	PTSD Checklist for DSM-5
PHQ-9	Patient Health Questionnaire-9
GAD-7	Generalized Anxiety Disorder 7-item scale
PSQI	Pittsburgh Sleep Quality Index
IRB	Institutional Review Board
CONSORT	Consolidated Standards of Reporting Trials
IDE	Investigational Device Exemption
TENS	Transcutaneous Electrical Nerve Stimulation
FDA	U.S. Food and Drug Administration
ISO	International Organization for Standardization
M.I.N.I.	Mini-International Neuropsychiatric Interview
C-SSRS	Columbia-Suicide Severity Rating Scale
WTCHP	World Trade Center Health Program
ANOVA	Analysis of Variance
M	Mean
SD	Standard Deviation
fMRI	functional Magnetic Resonance Imaging
IL-6	Interleukin-6