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Multiple correspondence analysis (MCA plot). Identification of 4 groups (phenotypes, P) of breakthrough cancer pain (BTcP) from P1 to P4 by combining the variables BTcP intensity (INT) score (INT_5; INT_6; INT_7; INT_8; INT_9; INT_10) and number of BTcP episodes per day (1_day; 2_day; 3_day; 4_day) with the categorical variable BTcP type (nociceptive, neuropathic, both).
