National health line.
Leukefeld
C G
CG
D006291:Health Policy / Q000191:economics / Q000639:trends*; D006801:Humans; D012947:Social Work / Q000458:organization & administration* / Q000639:trends; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000517:prevention & control*; D014481:United States