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