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Google Trends Internet search volume for ‘ankle swelling,’ ‘swollen ankles,’ ‘swollen feet, or ‘swollen legs’ in Australia (◊) and the United States (Δ) (August 29, 2010, to January 26, 2016).
Horizontal axis markers (Dec, Jun) are centered mid-month. The solid line and dashed line are best-fit sinusoids for Australia and the United States, respectively.
