1. Vitiligo Research Chair, Department of Dermatology, College of Medicine, King Saud University , Riyadh , Saudi Arabia
2. IMU Clinical School, Kluang , Kluang , Johor, 86000 , Malaysia
3. Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University , P.O. Box 2457 , Riyadh, 11451 , Saudi Arabia
4. Central Laboratory, College of Pharmacy, King Saud University , Riyadh, 11451 , Saudi Arabia