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DISEASE HAS TO BE DESCRIBED IN TERMS OF TIME: (EPIDEMIC, ENDEMIC, SPORADIC, PANDEMIC, CYCLICAL, SECULAR, SEASONAL)

PLACE (LOCAL, REGIONAL, NATIONAL, INTERNATIONAL) AND

PERSON (AGE, SEX, OCCUPATION, SOCIOECONOMIC STATUS, HOUSING TENURE, LITERACY, NUTRITIONAL STATUS, RACE, & ETHNICITY, MARRIED LIFE, LIFE STYLES & PERSONAL HABITS).