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APA Citation
Okal, J., Geibel, S., Muraguri, N., Musyoki, H., Tun, W., Broz, D., Kuria, D., Kim, A., Oluoch, T., & Raymond, H. F. (2013). estimates of the size of key populations at risk for HIV infection: men who have sex with men, female sex workers and injecting drug users in Nairobi, Kenya. Sexually transmitted infections, 89(5), 366–371. http://access.bl.uk/ark:/81055/vdc_100135133914.0x00000c