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J. J. CANNELL,
R. VIETH,
J. C. UMHAU,
M. F. HOLICK,
W. B. GRANT,
S. MADRONICH,
C. F. GARLAND
and E. GIOVANNUCCI
(2006).
Epidemic influenza and vitamin D. Epidemiology and Infection,
134
,
pp 1129-1140
doi:10.1017/S0950268806007175