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. 2016 Aug 8;6:31314. doi: 10.1038/srep31314

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The number of infected bank voles (bars and left-hand y-axis) in (a) spring and (b) fall in two time periods: 1979–1986 and 2003–2013 and Tengmalm’s owl nest box occupancy (%) (line and right-hand y-axis) in spring in 1980–2013.