Gallup measures its own health.
Abresch
C
C
Johnson
C
C
Abresch
B
B
D006293:Health Promotion; D006801:Humans; D007255:Information Services / Q000600:supply & distribution; D020407:Internet; D016272:Occupational Health; D012648:Self Care; D016896:Treatment Outcome; D014481:United States