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Incidence and severity of (a) nausea, (b) constipation, (c) somnolence, (d) sweating, and (e) pruritus. FEN, patients receiving transdermal fentanyl; SRM, patients receiving sustained release oral morphine. 1, incidence at day 1; 2–15, incidences at day 2, 3, etc. Numbers below x-axis show number of patients at each time point.
