Health and wealth in four societies.
D000328:Adult; D000368:Aged; D001531:Belize; D003431:Cross-Cultural Comparison; D006262:Health; D006304:Health Status; D006801:Humans; D014905:Independent State of Samoa; D007630:Kenya; D008875:Middle Aged; D009390:Nepal; D012959:Socioeconomic Factors