1. Centre for Drug Delivery Research, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz; 50300 Kuala Lumpur Malaysia
2. School of Chemical Sciences and Food Technology, Faculty of Science and Technology; Universiti Kebangsaan Malaysia; Bangi 43600 Selangor Malaysia
3. Department of Pharmacy; Forman Christian College (A Chattered University); Lahore 54600 Pakistan
4. School of Pharmacy, Faculty of Science and Engineering; University of Wolverhampton, Wulfruna Street; Wolverhampton WV1 1LY UK