1. Department of Surgery, University Hospital Mannheim, Germany;
2. Ministry of Health, Tamale, Northern Region, Ghana;
3. Department of Surgery, Mbarara University Teaching Hospital, Mbarara, Uganda;
4. Department of Surgery, King's College Teaching Hospital, London, UK;
5. Department of Surgery, St Marien-Krankenhaus, Kampenstr. 51, 57072 Siegen, Germany