DIMITRIS RIGOPOULOS, MD, is Professor of Dermatology and Venereology at the Medical School, National and Kapodistrian University of Athens, Athens, Greece.

BONI ELEWSKI, MD, is Professor and Chair of Dermatology at the University of Alabama, Birmingham, AL, USA.

BERTRAND RICHERT, MD, PhD, is Professor of Dermatology and Clinical Professor at Brugmann St Pierre and Queen Fabiola Children's University Hospitals, Université Libre de Bruxelles, Brussels, Belgium.