Unlinked anonymous testing to estimate HIV prevalence among pregnant women in Catalonia, Spain, 1994 to 2009 Carnicer-Pont, D and Almeda, J and Luis Marin, J and Martinez, C and Gonzalez-Soler, M V and Montoliu, A and Muñoz, R and Casabona, J and the HIV NADO working group, Collective, Eurosurveillance, 16, 19940 (2011), https://doi.org/10.2807/ese.16.32.19940-en