A cross-sectional study on prevalence of pain and breakthrough pain among an unselected group of outpatients in a tertiary cancer clinic

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Prognostic Assessment, Longitudinal Studies, Prognostic Comorbidity +11

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Pain Therapy, Pain Research, Pain Disorders +7

Pain and Its Treatment in Outpatients with Metastatic Cancer

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Development of the Wisconsin Brief Pain Questionnaire to assess pain in cancer and other diseases

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Family Medicine, Quality Of Life, Pain Therapy +16

Breakthrough pain: definition, prevalence and characteristics

Russell K. Portenoy, Neil A. Hagen · Pain · 1990 · 916 citations