Appropriateness of emergency department visits in a Portuguese University Hospital. - Pereira,S.; Oliveira e Silva,A.; Quintas,M.; Almeida,J.; Marujo,C.; Pizarro,M.; Angélico,V.; Fonseca,L.; Loureiro,E.; Barroso,S.; Machado,A.; Soares,M.; et al. (Annals of Emergency Medicine, 2001)