Fig. 1From: Helicopter transport of critical care COVID-19 patients in the Netherlands: protection against COVID-19 exposure-a challenge to critical care retrieval personnel in a novel operationExposure time as part of the time intervals. T1 = ‘rotor-stop-monitor-on’ until engine start at referral hospital. T2 = actual flight time. T3 = rotor stop at receiving hospital until ‘monitor-off-engine start-up’Back to article page