The proof of the pudding is in the eating: an outbreak of emetic syndrome after a kindergarten excursion, Berlin, Germany, December 2007 Kamga Wambo, G O and Burckhardt, F and Frank, C and Hiller, P and Wichmann-Schauer, H and Zuschneid, I and Hentschke, J and Hitzbleck, T and Contzen, M and Suckau, M and Stark, K, Eurosurveillance, 16, 19839 (2011), https://doi.org/10.2807/ese.16.15.19839-en