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1Pain Therapy and Palliative Care Division, National Cancer Institute of Milan, MilanItaly ∗Correspondence to: Dr. Vittorio Ventafridda, Pain Therapy and Palliative Care Division, National Cancer Institute of Milan, Via Venezian 1, 20133 Milan, Italy. Submitted November 27, 1990; accepted December 14, 1990.
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Ventafridda et al. (1991) studied this question.
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