1. Department of Surgery, School of Medicine, Health Science College, Addis Ababa University, Addis Ababa, Ethiopia
2. Deceased.
3. Department of Infectious Diseases, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
4. Department of Philosophy, Linguistics and Theory of Science, University of Gothenburg, Gothenburg, Sweden
5. Institute of Clinical Sciences, Department of Oncology, The Sahlgrenska Academy, University of Gothenburg and the Sahlgrenska University Hospital, Gothenburg, Sweden
6. Department of Applied Information Technology, University of Gothenburg, Gothenburg, Sweden