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Hong Kong
China
Macau
HIV Infections
Hepatitis C
Cluster Analysis
Risk Factors
Phylogeny
Prevalence
Intravenous Substance Abuse
Needle Sharing
Molecular Epidemiology
Male Homosexuality
Questionnaires
HIV-1
Drug Users
Young Adult
H1N1 Subtype Influenza A Virus
Methadone
Pandemics
Co-Publications
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3
2
1
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