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Lee, Yong Joo, Sang-Yeon Suh, Junghan Song, Sanghee Shiny Lee, Ah-Ram Seo, Hong-Yup Ahn, Myung Ah Lee, Chul-Min Kim, ja Pål Klepstad. "Serum and Urine Concentrations of Morphine and Morphine Metabolites in Patients With Advanced Cancer Receiving Continuous Intravenous Morphine: An Observational Study." BMC Palliat Care 2015.

Lee, Yong Joo, et al. "Serum and Urine Concentrations of Morphine and Morphine Metabolites in Patients With Advanced Cancer Receiving Continuous Intravenous Morphine: An Observational Study." BMC Palliat Care 2015.