title: To the Editor. South American Working Group in Interventional and Therapeutic Neuroradiology (SAWITN).
authors.affiliation: Servicio de Neuroradiologia Intervencionista, Hospital Beneficencia Portuguesa; Sao Paulo, Brazil - lemme@arnet.com.ar.
authors.forename: R L
authors.initials: RL
authors.lastname: Piske
authors.forename: L
authors.initials: L
authors.lastname: Lemme-Plaghos