CDC	Center for Disease Control and Prevention
DSM-III	The Diagnostic and Statistical Manual of Mental Disorders, Third Edition
FDNY	Fire Department of New York City
IOS	impulse oscillometry system
IRB	Institutional Review Board
IVQ	Initial visit questionnaires
LRS	lower respiratory symptoms
NCI	National Cancer Institute
NIOSH	National Institute of Occupational Safety and Health
PTSD	post-traumatic stress disorder
REDCap	Research Electronic Data Capture web application for building/managing database
ROC	receiver operating characteristic curve
SEER	NCI Surveillance, Epidemiology, End Results database
TCGA	the Cancer Genome Atlas database
WTC	World Trade Center
WTC EHC	WTC Environmental Health Center
WTCHP	World Trade Center Health Program
WTCHR	World Trade Center Health Registry.