A mass social-hygienic investigation of a very old population in various areas of the Soviet Union: program, procedure, results.
D000367:Age Factors; D000368:Aged; D000375:Aging; D003710:Demography; D005260:Female; D006262:Health; D006306:Health Surveys; D006801:Humans; D008136:Longevity; D008297:Male; D011159:Population Surveillance; D012737:Sex Factors; D012959:Socioeconomic Factors; D014586:USSR; D014798:Vital Statistics