RT Journal Article SR Electronic T1 Morphine Metabolites During Oral and Rectal Morphine Treatment in Patients with Intractable Cancer Pain JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 101 OP 101 DO 10.1136/rapm-00115550-199722021-00101 VO 22 IS Suppl 2 A1 J. Chrubasik A1 R. Aderjan A1 X. Du A1 G. Aykut A1 S. Chrubasik YR 1997 UL http://rapm.bmj.com/content/22/Suppl_2/101.abstract AB