Adult 1 Algorithms 1 Aryl Hydrocarbon Hydroxylases 1 Asian Continental Ancestry Group 1 CYP2B6 Polymorphism China 1 Chinese 1 Female 1 Gene Frequency 1 HIV/AIDS 1 Haplotypes 1 Heroin Dependence 1 Humans 1 India 1 Indian 1 Malaysia 1 Male 1 Methadone 1 Opiate Substitution Treatment 1 Oxidoreductases, N-Demethylating 1 Polymerase Chain Reaction 1 Polymorphism, Genetic 1 acquired immune deficiency syndrome 1 adult 1 allele 1 antiretrovirus agent 1 article 1 blood 1 cytochrome P450 2B6 1 ethnic difference 1