1. Department of Pharmaceutics, School of Pharmacy, Qingdao University, Qingdao, Shandong 266075, P. R. China
2. School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P. R. China
3. Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266003, P. R. China
4. Qingdao Women and Children’s Hospital, Qingdao, Shandong 266034, P. R. China