Columbia subject headings:
Homelessness--Health aspects--United States.
Mentally ill--Care--United States.
Poor--Medical care--United States.
Harvard subject headings:
Homeless persons--Diseases--United States.
Homeless persons--Medical care--United States.
Homelessness--Health aspects--United States.
Mentally ill--Care--United States
Poor--Medical care--United States
Princeton subject headings:
Homelessness--Hygienic aspects--United States.
Mentally ill--Care--United States.
Poor--Medical care--United States.