1. Division of Radiology, Medimagem, Teresina, PI, Brazil
2. Division of Radiology, Emergency Hospital in Teresina Dr. Zenon Rocha, Teresina, PI, Brazil
3. Division of Radiology, UDI 24 Hours, Teresina, PI, Brazil
4. Division of Radiology, Antonio Prudente Hospital, Fortaleza, CE, Brazil
5. Division of Radiology, UDI Hospital, São Luís, MA, Brazil