1. Mai Y, Dou L, Murdan S, et al. An animal’s sex influences the effects of the excipient PEG 400 on the intestinal P-gp protein and mRNA levels, which has implications for oral drug absorption.European journal of pharmaceutical sciences, 2018, 120: 53–60. 2. Mai Y, Murdan S, Awadi M, et al. Establishing an in vitro permeation model to predict the in vivo sex-related influence of PEG 400 on oral drug absorption. International journal of pharmaceutics, 2018, 542(1-2), 280–287.