Bio-behavioural HIV and STI surveillance among men who have sex with men in Europe: the Sialon II protocols by Lorenzo Gios, Massimo Mirandola, Igor Toskin, Ulrich Marcus, Sandra Dudareva-Vizule, Nigel Sherriff, Michele Breveglieri, Martina Furegato, Cinta Folch, Laia Ferrer, Alexandra Montoliu, Christiana Nöstlinger, Wim Vanden Berghe, Sharon Kühlmann-Berenzon, Inga Velicko, Sónia Dias, Barbara Suligoi, Vincenza Regine, Danica Stanekova, Magdalena Rosińska, Saulius Caplinskas, Irena Klavs, Ivailo Alexiev, Alexandru Rafila

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