Gastroenteritis outbreaks on cruise ships: contributing factors and thresholds for early outbreak detection Mouchtouri, Varvara A and Verykouki, Eleni and Zamfir, Dumitru and Hadjipetris, Christos and Lewis, Hannah C and Hadjichristodoulou, Christos and the EU SHIPSAN ACT partnership, Eurosurveillance, 22, 16-00576 (2017), https://doi.org/10.2807/1560-7917.ES.2017.22.45.16-00576