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Guerras J-M, Hoyos J, García de Olalla P, de la Fuente L, Herrero L, Palma D, del Romero J, García-Pérez J-N, Belza M-J, The Methysos Project Group. Comparison of Polydrug Use Prevalences and Typologies between Men Who Have Sex with Men and General Population Men, in Madrid and Barcelona. International Journal of Environmental Research and Public Health. 2021; 18(21):11609. https://doi.org/10.3390/ijerph182111609

Guerras, Juan-Miguel, Juan Hoyos, Patricia García de Olalla, Luis de la Fuente, Lidia Herrero, David Palma, Jorge del Romero, Jorge-Néstor García-Pérez, María-José Belza, and The Methysos Project Group. 2021. "Comparison of Polydrug Use Prevalences and Typologies between Men Who Have Sex with Men and General Population Men, in Madrid and Barcelona" International Journal of Environmental Research and Public Health 18, no. 21: 11609. https://doi.org/10.3390/ijerph182111609

Guerras, J.-M., Hoyos, J., García de Olalla, P., de la Fuente, L., Herrero, L., Palma, D., del Romero, J., García-Pérez, J.-N., Belza, M.-J., & The Methysos Project Group. (2021). Comparison of Polydrug Use Prevalences and Typologies between Men Who Have Sex with Men and General Population Men, in Madrid and Barcelona. International Journal of Environmental Research and Public Health, 18(21), 11609. https://doi.org/10.3390/ijerph182111609