1. Department of Neurology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
2. Department of Emergency Medicine-AirCare, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
3. Department of Mechanical and Industrial Engineering, College of Engineering, University of Iowa, Iowa City, IA, USA
4. Center for Stroke Research, Charité Universitätsmedizin Berlin, Berlin, Germany