COBA-Cohort: a prospective cohort of HIV-negative men who have sex with men, attending community-based HIV testing services in five European countries (a study protocol)

od Lorente, Nicolas, Fernàndez-López, Laura, Fuertes, Ricardo, Rojas Castro, Daniela, Pichon, François, Cigan, Bojan, Chanos, Sophocles, Meireles, Paula, Lucas, Raquel, Morel, Stéphane, Slaaen Kaye, Per, Agustí, Cristina, Klavs, Irena, Platteau, Tom, Casabona, Jordi
Izdano u BMJ Open (2016)