1. Emergency Medical Service, Ambulance IJsselland, Zwolle, 8013 PM, The Netherlands
2. Department of Cardiology, Leiden University Medical Center, Leiden, 2333 ZA, The Netherlands
3. Department of Clinical Chemistry, Isala, Zwolle, 8025 AB, The Netherlands
4. Emergency Medical Service, Ambulance Rotterdam Rijnmond, Barendrecht, 2993 LT, The Netherlands
5. Department of Cardiology, Maastricht University Medical Center, Maastricht, 6229 HX, The Netherlands
6. Department of Cardiology, Zuyderland MC, Heerlen, 6419 PC, The Netherlands
7. Emergency Department, Franciscus Gasthuis & Vlietland, Rotterdam, 3043 PM, The Netherlands
8. Emergency Department, Elisabeth-Tweesteden hospital, Tilburg, 5000 LC, The Netherlands