8Nozaki C, Saitoh A, Tamura N, et al. Antinocieeptive effect of oxycodone in diabetic mice[J]. Eur J Pharmacol, 2005,524( 1-3):75-79.
9Matthes HW, Maldonado R, Simonin F, et al. Loss of morphine-induced analgesia, reward effect and withdrawal symptoms in mice lacking the mu-opioid receptor gene [J]. Nature, 1996,383 (6603): 819-823.
10De Schepper HU, Cremonini F, Park M1, et al. Opioids and the gut: pharmacology and current clinical experience[J]. Neurogastroenterol Motil, 2004,16(4):383-394.