EMJ: Predictive performance of the common red flags in emergency department headache patients: a HEAD and HEAD-Colombia study
Kevin Chu,1 Anne- Maree Kelly ,2,3 Win Sen Kuan,4 Frances B Kinnear,5,6 Gerben Keijzers,7 Daniel Horner ,8 Said Laribi,9 Alejandro Cardozo,10 Mehmet Akif Karamercan,11 Sharon