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Qquellon, L., Vargas, S., Calvo, G., Diaz, D., Navarro, J., Lugo, E., Reyes-Díaz, M., & Konda, K. (n.d.). p547 Relationship length of gay male couples and sexually transmitted infections. Sexually transmitted infections, 95, A247. http://access.bl.uk/ark:/81055/vdc_100135560693.0x00000b