1. Department of Dermatology; King Khalid University Hospital; Riyadh Saudi Arabia
2. College of Medicine; King Saud University; Riyadh Saudi Arabia
3. Department of Dermatology; University Hospital of Lille; 2 Avenue Oscar Lambret Lille cedex 59037 France
4. Tufts University School of Medicine; Boston MA USA
5. Mount Sinai Hospital; New York NY USA