HIV-1 molecular transmission clusters in nine European countries and Canada: association with demographic and clinical factors oleh Dimitrios Paraskevis, Apostolos Beloukas, Kostantinos Stasinos, Nikos Pantazis, Carmen de Mendoza, Norbert Bannert, Laurence Meyer, Robert Zangerle, John Gill, Maria Prins, Antonella d’Arminio Montforte, Anne-Marte Bakken Kran, Kholoud Porter, Giota Touloumi, on behalf of the CASCADE collaboration of EuroCoord