Pain Practice · 2019 · 10 citations · 21 references
Even after a time span of over 15 years and several exchanges of pump systems, pain intensity was still reduced. After 3 years, IT drug dose remained unchanged with low side-effect and complication rates.
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Grading the severity of chronic pain
Michael Von Korff, Johan Ormel, Francis J. Keefe et al. · Pain · 1992 · 3K citations