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Fig. 1 | BMC Infectious Diseases

Fig. 1

From: Trends and associated factors of HIV, HCV and syphilis infection among different drug users in the China–Vietnam border area: an 11-year cross-sectional study (2010–2020)

Fig. 1

Flow chart of participants recruitment. Participants include: (1) Drug users recruited by peer educators through snowball sampling. (2) Drug users in the detoxification centers and methadone clinics during the recruitment period. Invalid questionnaires include: (1) without demographic data (2) without drug abuse records

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BMC Infectious Diseases

ISSN: 1471-2334

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