1. Department of Anesthesia; Juliane Marie Center; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark
2. Department of Anesthesia; Center of Head and Orthopedics; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark
3. Section for Transfusion Medicine; Capital Region Blood Bank; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark
4. Department of Anesthesiology; Copenhagen University Hospital; Herlev Hospital; Herlev Denmark