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Dulai, J., Salway, T., Thomson, K., Haag, D., Lachowsky, N., Grace, D., Edward, J., Grennan, T., Trussler, T., & Gilbert, M. (n.d.). o15.4 Investigating selection bias: cross-sample comparison of gay and bisexual men concurrently recruited from an sti clinic, sex-seeking apps, and a pride event in british columbia, canada. Sexually transmitted infections, 93, A35. http://access.bl.uk/ark:/81055/vdc_100137783420.0x000008