Geographic mapping method shows potential for mapping influenza activity in Europe Saito, Reiko and Paget, W J and Hitaka, S and Sakai, Takatsugu and Sasaki, Asami and van der Velde, K and Suzuki, Hiroshi, Weekly releases (1997–2007), 10, 2824 (2005), https://doi.org/10.2807/esw.10.43.02824-en