1 Ludwig Maximilian University of Munich, Munich, Germany.
2 Section of Vascular and Interventional Radiology, Department of Radiology and Biomedical Imaging, Yale School of Medicine, 20 York Street, New Haven, CT, 06510, USA. [email protected].
3 Muhimbili University of Health and Allied Sciences/Muhimbili National Hospital, Dar es Salaam, Tanzania.