TI - The need for national registries in rare diseases. [Carta] PY - 2006 AU - Souza, Rogério AU - Jardim, Carlos AU - Carvalho, Carlos Roberto Ribeiro de T2 - American Journal of Respiratory and Critical Care Medicine SN - 1073-449X UR - http://ajrccm.atsjournals.org/cgi/content/full/174/2/228 PP - New York VL - 174 IS - 2 SP - 214 ER -