3 ms·
Here: http://www.tandfonline.com/doi/abs/10.1080/00140139.2013.871064#.VWXFfNKqpBc http://www.tandfonline.com/doi/abs/10.1080/00140139.2013.871... ------------
by Ygg2 11y ago
Here: http://www.tandfonline.com/doi/abs/10.1080/00140139.2013.871064#.VWXFfNKqpBc http://www.tandfonline.com/doi/abs/10.1080/00140139.2013.871...
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But seriously, how can NOT putting large number of people together for long times not cause diseases? That's one of major reason flu starts during the winter...