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Effect of Morphine Sulfate Sustained-release Tablets as background medication combined with Morphine Hydrochloride Injection on moderate and severe cancerous pain
WANG Pengyuan   DONG Xueru   LIU Zhi   SHANG Nana#br#
Department of Oncology, Xuchang Central Hospital Affiliated to Henan University of Science and Technology, Henan Province, Xuchang   461000, China
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