Prehospital risk assessment in patients suspected of non-ST-segment elevation acute coronary syndrome: a systematic review and meta-analysis oleh Pim van der Harst, Jo M Zelis, Pim A L Tonino, Arjan Koks, Lukas R C Dekker, Jesse P A Demandt, Geert H J M Smits, Marcel van het Veer, Pieter-Jan Vlaar