Epidemiology of systemic sclerosis (scleroderma).
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D044469:Racial Groups; D012595:Scleroderma, Systemic / Q000453:epidemiology*; D012737:Sex Factors; D012959:Socioeconomic Factors; D013714:Tennessee; D014505:Urban Population