1. Department of Dermatology, The Warren Alpert Medical School, Brown University, Providence, RI 02903, USA
2. Section of Dermatopathology, Department of Dermatology, Chobanian and Avedisian School of Medicine, Boston University, Boston, MA 02118, USA
3. Department of Dermatology, Gilbert and Rose-Marie Chagoury School of Medicine, Lebanese American University, Beirut 13-5053, Lebanon