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Overall 2‐year survival among cancer chemotherapy patients, stratified by email users versus nonemail users. Abbreviations: Tx, Treatment. The median 2‐year survival was 78.29% (95% CI, 79.85%‐76.63%) for email users and 75.22% (95% CI, 76.79%‐73.55%) for nonemail users (difference, 5 months; p < 0.01). Email users were defined as patients who sent at least one email 12 months before through 2 months after the first date of chemotherapy treatment
