Reply to the letter by Calle and Mpotos: Why not try harder to prove that automated external defibrillators save lives?

We would like to thank Calle and Mpotos for their interest in the topic of automated external defibrillators (AEDs) and their valuable comments [1] on our article ‘Changes in automated external defibrillator use and survival after out-of-hospital cardiac arrest (OHCA) in the Nijmegen area’, published in the December issue of Netherlands Heart Journal