Figure 2.

Sources of caffeine intake according to quintiles of total caffeine intake. This figure shows sources of caffeine intake (food frequency questionnaire data) according to quintiles of total caffeine intake, n = 59,123, in the Norwegian Mother and Child Cohort Study 2002 to 2009.

Sengpiel et al. BMC Medicine 2013 11:42   doi:10.1186/1741-7015-11-42
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