Social class, susceptibility and sickness.
D004522:Educational Status; D004781:Environmental Exposure; D006296:Health Services; D006801:Humans; D008136:Longevity; D009017:Morbidity; D009026:Mortality; D012923:Social Class; D012959:Socioeconomic Factors; D013315:Stress, Psychological; D014481:United States