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http://journals.cambridge.org/action/displayAbstract?aid=1231812
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M. L. RUSSELL,
D. P. SCHOPFLOCHER,
L. SVENSON
and S. N. VIRANI
(2007).
Secular trends in the epidemiology of shingles in Alberta. Epidemiology and Infection, 135
,
pp 908-913
doi:10.1017/S0950268807007893