1. La Roche-Posay Dermatological Laboratories; Asnières France
2. Department of Dermatology; Hôpital Erasme; Université Libre de Bruxelles; Brussels Belgium
3. Department of Dermatology; George Washington School of Medicine and Health Sciences; Washington DC USA
4. Department of Physiology and Biophysics; Albert Einstein College of Medicine; Bronx NY USA