Keywords
Adolescent
Age Distribution
Amphetamine-Related Disorders
Behavioral Research
Birth Rate
Censuses
Child
China
Contraception Behavior
Data Collection
Demography
Drug Users
Emigration and Immigration
Epidemiologic Methods
Family Characteristics
Family Planning Services
Female
HIV Infections
Health Behavior
Health Surveys
Humans
Infant
Infant Mortality
Life Tables
Mortality
Patient Selection
Population Control
Population Dynamics
Population Surveillance
Sampling Studies
Sex Distribution
Sex Ratio
Sex Work
Sex Workers
Social networks
Socioeconomic Factors
Syphilis
Unsafe Sex