C.D. Marques, MD, PhD, Adjunct Professor of Rheumatology, Federal University of Pernambuco (UFPE), Recife, Pernambuco, Brazil.Address correspondence to Dr. C.D. Marques, Hospital das Clínicas, Universidade Federal de Pernambuco. Avenida Professor Moraes Rego, s/n - Recife - PE - CEP 50670-901 - Brazil. Email: