Model Drug as Pore Former for Controlled Release of Water-Soluble Metoprolol Succinate from Ethylcellulose-Coated Pellets Without Lag Phase: Opportunities and Challenges Journal title: AAPS PharmSciTech Authors: Yuli Wang, Jingjing Dai, Xinyi Chang, Meiyan Yang, Ruifang Shen, Li Shan, Yong Qian, Chunsheng Gao Subject(s): Medicine