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