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Cao, Zhen, Pei-Yin Lin, Zhi-Wei Shen, Ren-Hua Wu, et Ye-Yu Xiao. "Alterations in Brain Metabolism and Function Following Administration of Low-dose Codeine Phosphate: (1)H-magnetic Resonance Spectroscopy and Resting-state Functional Magnetic Resonance Imaging Studies." Exp Ther Med 2016.

Cao, Zhen, et al. "Alterations in Brain Metabolism and Function Following Administration of Low-dose Codeine Phosphate: (1)H-magnetic Resonance Spectroscopy and Resting-state Functional Magnetic Resonance Imaging Studies." Exp Ther Med 2016.