Nilton Di Chiacchio is Head of the Dermatologic Clinic, Hospital do Servidor Público Municipal de São Paulo, São Paulo, Brazil.Nilton Gioia Di Chiacchio is a dermatologist at Faculdade de Medicina do ABC, São André, and Hospital do Servidor Público Municipal de São Paulo, São Paulo, Brazil.Robertha Carvalho de Nakamura is a dermatologist at Instituto di Dermatologia, Santa Casa da Misericordia, Rio de Janeiro, Brazil.Michela Starace is a dermatologist at IRCCS Azienda Ospedaliero-Universitaria di Bologna and Assistant Professor at Alma Mater Studiorum, University of Bologna, Italy.Matilde Iorizzo is a dermatologist in private practice (Bellinzona and Lugano, Switzerland); she is also the vice President of the European Nail Society and the Secretary of the International Nail Society.Robert Baran is Head of the Nail Disease Center in Cannes, France; Baran and Dawber's Diseases of the Nails and their Management is now in its fifth edition.