Subjects: *TOBACCO products; *ELECTRONIC cigarettes; *TOBACCOCHINAWORLD Health Organization
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Subjects: EPIDEMIOLOGICAL transition; CHRONIC obstructive pulmonary disease; DISEASE risk factorsGUANGDONG Sheng (China); CHINA
Subjects: *COGNITION disorders; *NUTRITION surveys; *HEALTH surveysCHINAWORLD Health Organization
Subjects: SARS disease; SARS-CoV-2; COVID-19WUHAN (China); CHINA
Subjects: *MEDICAL care; *EPIDEMIOLOGY; *PATIENTSCHINAWORLD Health Organization