Hepatitis A and hepatitis A virus/HIV coinfection in men who have sex with men, Warsaw, Poland, September 2008 to September 2009 Dabrowska, M M and Nazzal, K and Wiercinska-Drapalo, A, Eurosurveillance, 16, 19950 (2011), https://doi.org/10.2807/ese.16.34.19950-en