Hepatitis A outbreak disproportionately affecting men who have sex with men (MSM) in the European Union and European Economic Area, June 2016 to May 2017., Ndumbi, Patricia, Freidl Gudrun S., Williams Christopher J., Mårdh Otilia, Varela Carmen, Avellón Ana, Friesema Ingrid, Vennema Harry, Beebeejaun Kazim, Ngui Siew Lin, et al. , Euro Surveill, 2018 08, Volume 23, Issue 33, (2018)